Author Archives: George@PW

Creating Bee-Friendly Spaces: Pollinator Patches and Stepping Stones in Sonoran Desert Neighborhoods

In Part 1 of this series we looked at how creating corridors, patches and stepping stones can enable pollinators in residential and commercial areas where their habitat has been grossly fragmented.

As the sun beats down on the Sonoran Desert, a bustling community of small bees seeks out sustenance amidst the arid landscape. Their journey is not without its challenges, but with a little help from conscientious residents, we can make a big difference. In this blog post, we’ll explore how pollinator patches and stepping stones play a crucial role in aiding these tiny navigators in their quest for food.

When it comes to bee foraging, two key factors come into play: body size and sociality. Large bees have the advantage of covering greater distances, enabling them to access patches and stepping stones that are further apart. This ability makes them more resilient in the face of habitat fragmentation.

Sociality, or the level of community within a bee species, also influences foraging behavior. Colonies, characterized by their complex communication strategies, can cover larger forage ranges compared to solitary bees. This enhanced communication allows them to efficiently navigate through fragmented habitats, ensuring a steady supply of nectar and pollen.

Imagine a small bee in a residential neighborhood, faced with patches of flowering plants scattered across the area. Without some strategically placed “stepping stones,” this journey can be a daunting task. Stepping stones act as intermediate stops, providing resting places and additional food sources for bees in transit.

For small bees, these stepping stones are a lifeline. They break up the long stretches between patches, offering much-needed respite and sustenance. By creating these intermediary stations, we can significantly enhance the chances of these pollinators successfully navigating our neighborhoods.

Highly social bee species, with their sophisticated communication networks, take resource management to a whole new level. Scouts are dispatched to identify and recruit nest mates to patches and stepping stones rich in high-quality resources. This collective effort ensures that the entire colony thrives.

However, it’s essential to note that large colonies, while efficient, can also locally deplete food sources due to their substantial population. This motivates them to venture further in search of sustenance. This behavior highlights the importance of maintaining a diverse range of flowering plants to support the diverse appetites of these generalist foragers.

By understanding the unique challenges small bees face in our Sonoran Desert neighborhood, we can take steps to make their journey a little easier. Through the creation of pollinator patches and stepping stones, we provide vital support to these essential pollinators. Together, we can transform our residential areas into vibrant, bee-friendly habitats that benefit both nature and our community. Let’s join hands in nurturing these tiny navigators on their quest for food!

In Part 3 of this series we present the interactive game Bee Savvy: Pollinator Pathways

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Resources

The potential and realized foraging movements of bees are differentially determined by body size and sociality

Bee Savvy: Pollinator Pathways – An Interactive Board Game

• Move your game piece to the first stopover and draw a card. Stepping Stone or Patch cards move you forward. Obstacle cards require a role of the die.
• Continue drawing a card at each stopover until you move your game piece to the FINISH.

Beyond Beauty: The Ecological Significance of Pollinator Gardens

The Importance of Pollinators

Before delving into the how-to, it’s crucial to grasp why supporting pollinators is so vital. These tiny creatures play a monumental role in our ecosystem by facilitating the reproduction of flowering plants, including many of the fruits and vegetables that make up a significant portion of our diet. Without them, our food systems and natural landscapes would be drastically altered.

In addition:

• Pollinators contribute significantly to the biodiversity of an ecosystem. By facilitating the reproduction of a wide range of flowering plants, they help maintain a diverse array of plant species. This, in turn, provides habitat and food sources for countless other creatures.
• Pollinators are at the heart of the food web. They serve as a link between plants and many other species, including insects, birds, and mammals. Predators, like birds and insects, rely on the insects that feed on plants, which, in turn, rely on the plants themselves.
• The movement of pollinators from plant to plant facilitates genetic diversity within plant populations. This genetic diversity is essential for a species’ resilience to environmental changes, diseases, and pests.
• Plants that are pollinated and produce seeds help stabilize soil and prevent erosion. This is crucial for maintaining the integrity of ecosystems, particularly in areas prone to erosion.
• The presence of vibrant, blooming plants and the activity of pollinators enhance the beauty and aesthetic value of natural spaces. This, in turn, contributes to the well-being and enjoyment of humans who interact with these environments.

Steps to Creating a Healthy Pollinator Habitat

Step 1: Research and Select Pollinator-Friendly Plants

The foundation of any pollinator garden is the plants themselves. Opt for native species whenever possible, as they are best adapted to the local environment and the native pollinators that rely on them. Include a diverse selection of plants that bloom at different times, ensuring a steady supply of nectar and pollen throughout the growing season.

Step 2: Plan for Variety and Color

Think beyond aesthetics; choose plants with a variety of flower shapes and colors to attract a diverse range of pollinators. Different species are attracted to different colors and shapes, so providing a diverse palette will entice a broader spectrum of visitors.

Step 3: Provide Water and Nesting Sites

All living things need water, and pollinators are no exception. Include a shallow dish with rocks for them to drink from. Additionally, consider leaving the structural remains of annuals and perennials because they serve as nesting sites for some bees. Leave patches of bare soil for ground-nesting bees.

Step 4: Avoid Pesticides and Chemicals

To truly create a sanctuary for pollinators, it’s crucial to avoid the use of pesticides and harmful chemicals. These can harm the very creatures you’re trying to support. Instead, opt for natural pest control methods and let nature find its balance.

Step 5: Maintain and Monitor Your Garden

Regular maintenance is key to a thriving pollinator garden. Deadhead spent flowers to encourage continuous blooming, weed regularly, and keep an eye out for any signs of stress or disease in your plants. By staying vigilant, you can address issues before they become major problems.

Step 6: Educate and Share

Spread the word about the importance of pollinator-friendly gardens. Encourage your neighbors, friends, and community to join in this vital effort. Together, we can create a network of pollinator oases that make a real difference for these crucial creatures.

Unlocking the Secrets of the Sonoran Desert Ecosystem

In this 3 part series we’ll look at how you can help native bees survive in a Sonoran Desert that is increasing fragmented by development. Part 3 presents an interactive game that illustrates the opportunities and obstacles that native bees face while foraging for food.

Understanding the Importance of Pollinators

Pollinators, including bees, butterflies, hummingbirds, and other insects, play a vital role in the reproduction of flowering plants. They facilitate the transfer of pollen from the male parts (anther) to the female parts (stigma) of flowers, allowing for the production of seeds and fruits. This process is fundamental for the survival of many plant species and provides the foundation for a diverse range of wildlife, including mammals, birds, and insects.

Here are the key components of this conservation strategy:

Pollinator Pathways

Pollinator pathways are linear habitats that allow pollinators to move across different landscapes. These pathways can be natural, like riverbanks or ridge lines, or human-made, such as roadsides planted with native vegetation.

By creating continuous routes, pollinator pathways help insects and birds navigate through urban areas, agricultural lands, and natural habitats. They are essential for gene flow among populations, which contributes to genetic diversity and resilience.

Patches

Patches refer to small, isolated areas of habitat within a larger landscape. They can be meadows, gardens, or any area with flowering plants.

Patches serve as local hubs for pollinators. Even in urban environments, well-maintained gardens with native plants can provide essential resources like nectar and pollen. Patches are especially important for sustaining pollinator populations in areas where large-scale habitats are scarce.

Stepping Stones

Stepping stones are discrete habitats that help bridge the gap between larger, more stable environments. These can be small, isolated natural areas or carefully designed gardens.

Stepping stones act as refuges, allowing pollinators to rest, feed, and reproduce during their journeys. They are particularly critical in urban and agricultural landscapes where continuous habitats may be lacking.

Implementing Pollinator Conservation in the Sonoran Desert

Conservation efforts in the Sonoran Desert should focus on creating and maintaining these vital elements. This can be achieved through a combination of:

• Native Plant Landscaping: Using native plants in gardens and landscapes helps provide essential food and habitat for pollinators.
• Habitat Restoration: Rehabilitating degraded habitats and ensuring the survival of native plant species is crucial for maintaining healthy pollinator populations.
• Education and Outreach: Raising awareness about the importance of pollinators and the role of these pathways is essential for garnering community support.
• Policy and Planning: Incorporating pollinator-friendly practices into land use planning and conservation policies is vital for long-term success.

By establishing and preserving pollinator pathways, corridors, patches, and stepping stones, we can protect the intricate web of life that calls the Sonoran Desert home. This interconnected approach to conservation not only benefits pollinators but also contributes to the overall health and resilience of this extraordinary ecosystem. Together, we can ensure that the Sonoran Desert continues to thrive for generations to come.

In Part 2 of this series we’ll look at how habitat fragmentation affects native bee foraging and population.

Imagine stepping into a garden that perfectly captures the beauty and resilience of the Sonoran Desert. With vibrant blooms and a thriving ecosystem, it’s a sight to behold. And now, with our innovative garden plant tags, you can take your Sonoran Desert pollinator garden to the next level.

Let’s talk about the magic of a Sonoran Desert pollinator garden. By carefully selecting native plants that thrive in the arid conditions of the desert, you’re creating a sustainable oasis for local pollinators. Imagine the vibrant colors of desert marigolds, the delicate beauty of hummingbird sage, and the fragrance of desert lavender, all working together to attract bees, butterflies, and hummingbirds.

The innovative plant tags take your garden experience to a whole new level. Picture walking through your Sonoran Desert pollinator garden, scanning the tags with your smartphone, and discovering a wealth of knowledge at your fingertips. You learn about the unique adaptations of each plant to the desert climate, discover the best ways to care for them, and deepen your understanding of the intricate relationships between plants and pollinators.

But it doesn’t stop there. These plant tags are game-changers for pollinator conservation. By incorporating them into your garden, you become part of a larger mission to create pollinator corridors, pathways, patches, and stepping stones. Your garden becomes a sanctuary, a safe haven for bees, butterflies, hummingbirds, and other pollinators. By supporting these incredible creatures, you’re contributing to the ecological balance of our world.

We’re not in this alone. Let’s join forces with local garden centers, schools, and environmental organizations to spread the word about the importance of pollinator conservation. Together, we can transform our neighborhoods, schools, and public spaces into vibrant, educational interpretive trails that celebrate the wonders of nature.

Welcome to the mesmerizing realm of butterflies in the Sonoran Desert, where a kaleidoscope of colors dances through the arid landscapes. These exquisite creatures, such as the Painted Lady, Arizona Sister, Common Sootywing, White-lined Sphinx, and American Snout, grace the desert with their delicate beauty.

Let’s take a brief look at their preferred host plants, nectar plants and their seasonal patterns as they enchant the Sonoran Desert from spring to fall.

• Host Plants: Painted Lady caterpillars feed on a wide array of plants, including thistles, asters, mallows, hollyhocks, and various legumes.
• Nectar Plants: Painted Ladies visit a variety of flowers, such as sunflowers, thistles, asters, and zinnias, for nectar.
• Seasonality: Painted Ladies are highly migratory and can be seen in the Sonoran Desert during their spring and fall migrations.
• Preferred Environments: Painted Ladies are adaptable and can be found in various habitats, including deserts, grasslands, and gardens.

• Host Plants: Queen butterfly larvae primarily feed on milkweed species (Asclepias spp.), similar to Monarchs.
• Nectar Plants: They are attracted to a variety of flowers, including milkweed, lantana, thistles, and sunflowers.
• Seasonality: Queens can be found in the Sonoran Desert year-round, but they are more abundant during spring and fall.
• Preferred Environments: Queen butterflies inhabit a wide range of habitats, including deserts, arid scrublands, and cultivated areas.

• Host Plants: The caterpillars of White-lined Sphinx Moths feed on various plants, such as members of the evening primrose family (Onagraceae) and grape family (Vitaceae).
• Nectar Plants: Adults seek nectar from a variety of flowers, including desert marigolds, petunias, and penstemons.
• Seasonality: These moths can be observed in the Sonoran Desert from late spring to early fall.
• Preferred Environments: White-lined Sphinx Moths are found in a range of habitats, including desert washes, arid grasslands, and suburban areas.

• Host Plants: Pipevine Swallowtail caterpillars feed on pipevine species (Aristolochia spp.), which contain toxic compounds that make them unpalatable to predators.
• Nectar Plants: Adults are attracted to flowers like milkweed, thistles, lantana, and butterfly bush for nectar.
• Seasonality: Pipevine Swallowtails can be seen in the Sonoran Desert from late spring to early fall.
• Preferred Environments: They prefer riparian habitats, canyons, and other areas where their host plants grow.

• Host Plants: The larvae of Western Pygmy-Blues feed on legumes such as mesquites (Prosopis spp.) and other small plants.
• Nectar Plants: Adults obtain nectar from various tiny flowers, including desert marigold (Baileya multiradiata), brittlebush (Encelia farinosa), and desert lavender (Hyptis emoryi).
• Seasonality: Western Pygmy-Blues are typically seen from late spring to early fall in the Sonoran Desert.
• Preferred Environments: These butterflies prefer open areas, including desert scrub, dry washes, and sandy areas.

• Host Plants: The caterpillars of Checkered White Butterflies feed on plants from the mustard family (Brassicaceae), such as desert marigold (Baileya multiradiata) and desert pepperweed (Lepidium fremontii).
• Nectar Plants: Adults are attracted to a variety of flowers, including desert marigold, dandelions, and desert lavender.
• Seasonality: Checkered White Butterflies are commonly seen in the Sonoran Desert from late winter to spring and occasionally in the fall.
• Preferred Environments: They inhabit open areas, including desert washes, dry grasslands, and disturbed areas.

• Host Plants: The larvae of Marine Blue Butterflies primarily feed on legumes, including indigo bush (Psorothamnus spp.) and other small plants.
• Nectar Plants: Adults are attracted to flowers such as desert lavender, desert marigold, and catclaw acacia (Acacia greggii) for nectar.
• Seasonality: Marine Blue Butterflies can be observed in the Sonoran Desert from late spring to early fall.

• Host Plants: The larvae of Funereal Duskywings feed on plants from the pea family (Fabaceae), including mesquites (Prosopis spp.) and legumes.
• Nectar Plants: Adults are attracted to various flowers such as desert marigold, desert lavender, and milkweeds.
• Seasonality: Funereal Duskywings are commonly seen in the Sonoran Desert from spring to early fall.
• Preferred Environments: They inhabit diverse habitats, including desert washes, arid grasslands, and mesquite bosques.

• Host Plants: The caterpillars of Empress Leilia butterflies feed on plants from the nettle family (Urticaceae), including stinging nettle (Urtica spp.).
• Nectar Plants: Adults visit a variety of flowers such as desert marigold, desert lavender, and thistles for nectar.
• Seasonality: Empress Leilia butterflies can be observed in the Sonoran Desert from spring to fall.
• Preferred Environments: They inhabit diverse habitats, including desert washes, riparian areas, and open woodlands.

• Host Plants: Sleepy Orange caterpillars feed on plants from the pea family (Fabaceae), including Senna spp, wild sensitive plant (Mimosa biuncifera) and various legumes.
• Nectar Plants: Adults are attracted to flowers such as desert marigold, desert lavender, and lantana for nectar.
• Seasonality: Sleepy Orange butterflies are commonly seen in the Sonoran Desert from spring to fall.
• Preferred Environments: They inhabit a range of open habitats, including deserts, grasslands, and disturbed areas.

• Host Plants: Mexican Yellow caterpillars feed on plants from the pea family (Fabaceae), including various legumes and wild sensitive plant (Mimosa biuncifera).
• Nectar Plants: Adults seek nectar from a variety of flowers, including desert marigold, desert lavender, and thistles.
• Seasonality: Mexican Yellow butterflies can be observed in the Sonoran Desert from spring to fall.
• Preferred Environments: They prefer open habitats, including deserts, grasslands, and desert scrub.

• Host Plants: The larvae of Texan Crescent butterflies feed on plants from the aster family (Asteraceae), including asters and sunflowers.
• Nectar Plants: Adults visit various flowers such as desert marigold, desert lavender, and asters for nectar.
• Seasonality: Texan Crescent butterflies are commonly seen in the Sonoran Desert from spring to fall.
• Preferred Environments: They inhabit a variety of open habitats, including deserts, grasslands, and desert scrub.

• Host Plants: Reakirt’s Blue caterpillars feed on plants from the pea family (Fabaceae), including various legumes and vetches.
• Nectar Plants: Adults seek nectar from flowers such as desert marigold, desert lavender, and wildflowers from the pea family.
• Seasonality: Reakirt’s Blue butterflies can be observed in the Sonoran Desert from spring to fall.
• Preferred Environments: They inhabit open areas, including desert washes, grasslands, and disturbed areas.

• Host Plants: Orange Sulphur caterpillars feed on plants from the pea family (Fabaceae), including various clover species.
• Nectar Plants: Adults seek nectar from a variety of flowers, including desert marigold, desert lavender, and wildflowers from the pea family.
• Seasonality: Orange Sulphur butterflies are commonly seen in the Sonoran Desert from spring to fall.
• Preferred Environments: They prefer open areas, including desert washes, grasslands, and meadows.

• Host Plants: Variegated Fritillary caterpillars feed on plants from the violet family (Violaceae), including various violets (Viola spp.).
• Nectar Plants: Adults visit a variety of flowers, including desert marigold, desert lavender, and asters for nectar.
• Seasonality: Variegated Fritillary butterflies can be observed in the Sonoran Desert from spring to fall.
• Preferred Environments: They inhabit diverse habitats, including desert washes, open woodlands, and disturbed areas.

• Host Plants: Gulf Fritillary caterpillars feed on passionflower vines (Passifloraceae), including species like the native yellow passionflower (Passiflora lutea) and the non-native purple passionflower (Passiflora incarnata).
• Nectar Plants: Adults are attracted to a variety of flowers, including desert marigold, desert lavender, lantana, and milkweeds.
• Seasonality: Gulf Fritillaries are commonly seen in the Sonoran Desert from spring to fall.
• Preferred Environments: They inhabit diverse habitats, including desert washes, open woodlands, urban gardens, and areas with suitable passionflower host plants.

To see more of our Sonoran Desert butterflies, visit our Butterflies page at http://pollinatorweb.com/butterflies/butterflies/.

Pollinator corridors, pathways, stepping stones, and patches are all integral components of creating a welcoming and sustainable environment for our pollinator friends. These terms refer to the intentional design and creation of interconnected habitats that offer food, shelter, and resources to support the diverse range of pollinators, including bees, butterflies, birds, and bats.

Together, these elements contribute to the formation of a vibrant and interconnected network of habitats that support the health and well-being of pollinators and the ecosystems they inhabit.

Pollinators are a diverse group of animals that play a crucial role in plant reproduction. These animals include bees, butterflies, birds, bats, and many other species. They visit flowers to gather nectar and pollen, and as they move from flower to flower, they inadvertently transfer pollen from one plant to another. This process of pollination is essential for the fertilization of plants and the production of seeds and fruit.

Plants, in turn, have evolved a range of strategies to attract pollinators. Flowers are often brightly colored and have distinctive shapes and patterns that are adapted to the preferences of different pollinators. Some flowers, for example, have long, tubular shapes that are ideal for feeding hummingbirds, while others have flat, open shapes that are more attractive to butterflies and bees.

In addition to their visual cues, many flowers produce scents that are attractive to pollinators. These scents can range from sweet and floral to musky and earthy, and they are often most potent during the hours when the pollinators are most active. Some plants even produce nectar rewards for their pollinators, providing them with a valuable source of energy and nutrition.

This dynamic interaction between plants and pollinators creates an ecological pollinator web that is both fascinating and essential. The web is made up of a wide range of different species, each with its own unique role to play in the ecosystem.

Pollinator gardens play a crucial role in facilitating and supporting the intricate pollinator web. By creating habitats that provide a diverse array of flowers and resources, these gardens attract and sustain a wide range of pollinator species. The interconnected network of pollinator gardens acts as stepping stones, corridors, and patches that enable pollinators to move, forage, and reproduce, thereby enhancing genetic diversity and resilience within the pollinator populations.

Pollinator gardens also provide essential food sources and shelter, ensuring the survival of pollinators throughout their life cycles. As we cultivate pollinator-friendly gardens, we contribute to the preservation of the pollinator web, fostering a harmonious coexistence between plants and pollinators while safeguarding the health of our ecosystems. So, let us embrace the power of pollinator gardens and embrace our role in supporting these incredible creatures for a sustainable future.

The migratory path of Monarch butterflies occurs in Phoenix during their annual journey between their overwintering sites in Mexico and their breeding grounds in the northern United States and Canada. Monarchs undertake this remarkable journey spanning thousands of miles, and along the way, they rely on various resources, including nectar-rich flowers and specific host plants like milkweed.

A pollinator garden in Phoenix can play a crucial role in supporting Monarch butterflies during their migration. These gardens are designed to provide habitat and food sources for pollinators, including butterflies, bees, and hummingbirds. By planting a diverse array of native flowering plants, particularly those that bloom during the Monarchs’ migration season, gardeners can attract and support these magnificent butterflies.

In terms of preferences for specific species of milkweed, Monarchs exhibit varying preferences based on their geographic location, migratory path and availability of different milkweed species. In the Phoenix, a few species of milkweed are commonly found. These include the Desert Milkweed (Asclepias subulata), Showy Milkweed (Asclepias speciosa), Narrowleaf Milkweed (Asclepias fascicularis) and Butterfly Weed (Asclepias tuberosa).

While Monarchs generally show a preference for native milkweed species, they can adapt to utilizing non-native species as well. However, it is important to note that native milkweed species are typically better adapted to local climates and provide a more sustainable habitat for Monarchs and other pollinators. See also Milkweeds in the Sonoran Desert.

The presence and abundance of these and other milkweed species along the migratory path can impact the preferences of Monarchs. The availability of suitable milkweed species plays a significant role in determining the success of Monarch breeding and reproduction along their journey.

Additionally, native milkweed species often have co-evolved relationships with Monarchs, offering optimal nutritional content and defenses against predators and parasites.

To create a pollinator garden that attracts Monarchs, incorporate a mix of native milkweed species along with other nectar-rich flowering plants. This not only provides essential food for Monarch caterpillars but also offers adult butterflies a diverse range of nectar sources during their stopovers in Phoenix.

Overall, by creating a pollinator garden with a variety of native milkweed species and nectar-rich flowers, you can contribute to the conservation of Monarch butterflies and support their migration journey by providing vital resources along their migratory path.

Bee flies are an essential part of the pollinator garden in Arizona, serving a crucial role in pollination and as predators of other insects.

Physiologically, bee flies have a distinctive appearance that sets them apart from other flies. They are covered in long, dense hairs that give them a fuzzy appearance. Their wings are clear and veined, and their eyes are large and often brightly colored. They have long, slender legs and a distinctive proboscis that they use to feed on nectar from flowers.

And adult bee flies are expert fliers, able to hover in mid-air and make lightning fast changes in direction.

As adults, bee flies feed on nectar and pollen from flowers, serving as important pollinators in the garden. Unlike other pollinators, bee flies do not have specialized structures for collecting and carrying pollen, such as pollen baskets or hairs. Instead, they rely on a process called “hairy-footed flower visitation,” in which pollen becomes attached to the hairs on their legs and bodies as they feed on nectar. When they visit another flower, some of this pollen is transferred, allowing for pollination to occur.

The life cycle of bee flies begins with females laying eggs often near burrows of host insects, such as bees, wasps, but they can also host on beetle grubs, caterpillars, flies and grasshoppers. The eggs hatch into a worm-like maggot that feeds on the host.

Bee flies are also important indicators of the health of pollinator communities. Because they are sensitive to changes in the environment and require specific habitats and food sources, their presence or absence can signal changes in the overall health of the ecosystem. In addition, their role as predators of other insects can help maintain a healthy balance of species in the garden.

To attract bee flies to a pollinator garden, it is important to provide a variety of flowers that bloom throughout the growing season. Bee flies are active from early spring to late fall, so having a variety of flowers that bloom at different times will provide a continuous food source for them. Some of the flowers that are attractive to bee flies include penstemon, milkweed, goldenrod, and asters.

In addition to providing a variety of flowers, it is important to provide a habitat for bee flies. This can be done by providing areas of bare soil or mulch where they can lay their eggs, as well as areas of vegetation where their larvae can feed. Providing shelter, such as small rocks or logs, can also create a habitat for bee flies.

If you’re looking to add a touch of desert beauty to your low desert garden, you might want to consider planting a Palo Verde tree. These stunning trees are native to the Sonoran Desert and are perfectly suited for the arid climate of the low desert.

Here are the four species of Palo Verde native to the Sonoran Desert, plus a hybrid that does well in a low desert pollinator garden:

1. Blue Palo Verde (Parkinsonia florida): The Blue Palo Verde is a medium-sized tree, reaching heights of up to 30 feet and a spread of 20-30 feet. The tree is characterized by its blue-green bark and thornless branches. In the spring, it produces an abundance of bright yellow flowers, which attract bees and other pollinators.
2. Mexican Palo Verde (Parkinsonia aculeata): The Mexican Palo Verde is similar in appearance to the Blue Palo Verde, but has thorns along its branches and trunk. It also has a slightly more compact growth habit, typically reaching heights of up to 25 feet and a spread of 15-20 feet. It produces yellow flowers in the spring and summer, and its bark is green when young and turns gray with age.
   *This species is not recommended for low desert gardens because it has weak wood and can become very weedy.
3. Palo Brea (Parkinsonia praecox): The Sonoran Palo Verde is a larger tree than the Blue or Mexican Palo Verde, reaching heights of up to 40 feet and a spread of 20-30 feet. It has larger leaves and a more open canopy than the other two species, providing more shade. The bark of the Sonoran Palo Verde is green when young and turns gray with age. In the spring, it produces yellow flowers.
4. Littleleaf Palo Verde (Parkinsonia microphylla): The Littleleaf Palo Verde is a smaller tree, reaching heights of up to 20 feet and a spread of 15-20 feet. It has smaller leaves and a more delicate appearance than the other Palo Verde species. Its bark is green when young and turns gray with age. In the spring, it produces yellow flowers.
5. Desert Museum Palo Verde (Parkinsonia x ‘Desert Museum’) is a hybrid species that was developed specifically for the low desert. It’s a cross between the Blue and Mexican Palo Verde, and combines the best traits of both. It has a longer flowering period than either parent, with yellow blooms from spring to fall. It also has a larger, more open canopy than either parent, making it an excellent shade tree.

All of these Palo Verde species are drought-tolerant and can survive on natural rainfall alone once established. They are well-suited to the hot, dry conditions of the Sonoran Desert and make excellent additions to desert gardens. They also provide habitat and food for a variety of wildlife, including birds, insects, and small mammals. If you’re looking for a beautiful and low-maintenance tree for your Sonoran Desert garden, consider one of these stunning Palo Verde species.

The Staghorn and Buckhorn chollas are two species of cacti that are native to the southwestern United States and northern Mexico. Although they are similar in many ways, there are also some key differences between the two species that make them unique. In this article, we will explore the similarities and differences between the Staghorn and Buckhorn chollas, and where you can find them growing in the wild.

While both species of cholla are adapted to living in dry, desert environments, they have different strategies for coping with the extreme conditions. The Staghorn cholla has a thick, waxy coating on its stems that helps to prevent water loss, while the Buckhorn cholla has a more efficient water storage system in its stem. Additionally, the spines of the Buckhorn cholla are longer and more flexible, allowing the plant to sway in the wind and prevent overheating, while the Staghorn cholla’s spines are shorter and stiffer.

Both the Staghorn and Buckhorn chollas are adapted to living in the harsh conditions of the Sonoran Desert, and have developed a range of unique adaptations that allow them to survive in this extreme environment. From their dense clusters of spines to their ability to store water in their fleshy stems, these cholla species are true marvels of nature. Whether you’re exploring rocky hillsides or sandy washes, keep an eye out for these fascinating plants and take a moment to appreciate the unique beauty of the Sonoran Desert

Cacti are a group of plants that have adapted to thrive in some of the harshest conditions on earth, including the Sonoran Desert.

The Sonoran Desert spans parts of California, Arizona, and Mexico, and is known for its extreme heat, lack of rainfall, and harsh winds. Despite these challenging conditions, cacti have developed a range of adaptations that allow them to survive and even thrive in this environment.

Cacti have also developed adaptations to reduce water loss through transpiration. Transpiration is the process by which plants lose water through their leaves. In the Sonoran Desert, where water is scarce, cacti have evolved to have fewer leaves than other plants, which reduces the amount of water lost through transpiration.

Cacti have also developed adaptations to deal with the extreme temperatures of the Sonoran Desert. During the day, the temperature in the desert can soar to over 100 degrees Fahrenheit. At night, it can drop below freezing. To cope with these extreme temperatures, cacti have evolved to open their stomata (pores on the surface of the plant that allow for gas exchange) at night when it is cooler, and close them during the day when it is hotter. This helps the cactus conserve water and reduce the risk of dehydration.

Most cacti have shallow root systems that spread out widely from the base of the plant, which allows them to quickly absorb any rainwater that falls. However, during the long periods of drought that are common in the Sonoran Desert, cacti rely on their thick, fleshy stems to store water.

Additionally, some cacti have developed the ability to bloom at night, which allows them to attract pollinators during cooler periods of the day when water loss is lower.

Cacti are a remarkable group of plants that have adapted to survive in some of the most extreme conditions on earth. Through a combination of water storage, reduced water loss, spines, and other adaptations, cacti have found a way to thrive in the Sonoran Desert.

Aloes are a group of succulent plants that belong to the family Asphodelaceae. They are native to Madagascar, and the Arabian Peninsula, and are known for their fleshy leaves that are arranged in a rosette pattern.

These leaves often have sharp, pointed ends and a variety of interesting textures and shapes. The flowers of aloes are equally as impressive, typically appearing as long, tubular blooms that range in color from red and orange to pink and yellow.

In addition to their beauty, aloe species provide important benefits for pollinators in the Sonoran Desert. Their nectar-rich flowers serve as an important food source for a variety of pollinators, especially during times when other plants may not be in bloom. The thick leaves of aloe plants also provide shelter and nesting sites for a variety of insects and small animals, including lizards and rodents.

When designing a pollinator garden in the Sonoran Desert, including a variety of aloe species can provide not only aesthetic beauty but also essential food and habitat for a variety of pollinators. Some recommended species for Sonoran Desert gardens include Aloe vera, Aloe ferox, and Aloe striata, among others.

Here are 10 popular aloe species that are great for a low desert pollinator garden:

1. Aloe vera: Perhaps the most well-known aloe species, Aloe vera is a succulent plant that produces a gel used in a variety of health and beauty products. It has yellow or orange tubular flowers that bloom in the winter and spring, attracting bees and butterflies.
2. Aloe brevifolia: This aloe species has a low-growing rosette of blue-green leaves and produces tall spikes of pink or yellow flowers in the summer. It’s a favorite of hummingbirds and bees.
3. Aloe arborescens: This tree-like aloe species can grow up to 10 feet tall and produces large clusters of orange or red flowers that bloom in the winter and spring. It’s a favorite of birds, bees, and butterflies.
4. Aloe ferox: This South African aloe species has tall spikes of red or orange flowers that bloom in the winter and spring, attracting bees and birds. It’s also known for its medicinal properties.
5. Aloe aristata: Also known as lace aloe, this aloe species has small rosettes of green leaves that are covered in white spots. It produces tall spikes of pink or orange flowers that bloom in the summer, attracting bees and butterflies.
6. Aloe humilis: This aloe species has a low-growing rosette of blue-green leaves and produces tall spikes of pink or yellow flowers in the winter and spring. It’s a favorite of hummingbirds and bees.
7. Aloe marlothii: This tree-like aloe species can grow up to 20 feet tall and produces tall spikes of orange or red flowers that bloom in the winter and spring. It’s a favorite of birds, bees, and butterflies.
8. Aloe maculata: This aloe species has a low-growing rosette of green leaves that are covered in white spots. It produces tall spikes of orange or red flowers that bloom in the summer, attracting bees and butterflies.
9. Aloe pearsonii: This aloe species has a low-growing rosette of green leaves and produces tall spikes of red or yellow flowers in the winter and spring, attracting bees and birds.
10. Aloe saponaria: This aloe species has a low-growing rosette of green leaves and produces tall spikes of red or orange flowers in the winter and spring, attracting bees and butterflies. It’s also known for its soap-like sap that was used by indigenous peoples for cleaning.

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The Sonoran Desert is home to a vast array of plant species, each with unique adaptations to survive in the harsh desert environment. Among the most iconic and important of these plants are the agaves. These hardy succulents not only play a crucial role in the desert ecosystem but also serve as vital habitat and food sources for a variety of pollinators.

One of the most fascinating aspects of agaves is their unique reproductive strategy. Unlike many other plants, agaves rely on pollinators to help them reproduce. The plants produce a single, towering inflorescence, which can reach up to 30 feet tall in some species. The inflorescence is covered in thousands of small flowers, each with nectar-rich blooms that attract a variety of pollinators, including bees, moths, and hummingbirds.

Agaves are particularly important for pollinators because they bloom at a time of year when few other plants are in flower. Many species of agave bloom in the late spring or early summer, providing a critical source of food for pollinators during this time. Some agave species are even known to produce nectar throughout the night, providing a vital food source for nocturnal pollinators such as bats and moths.

In addition to providing food for pollinators, agaves also serve as important habitat for a variety of species. The thick leaves of agave plants provide shelter and nesting sites for a variety of insects and small animals, including lizards and rodents. Some species of birds also use agaves as nesting sites, building their nests among the leaves of the plants.

Overall, agaves are a fascinating and vital component of the Sonoran Desert ecosystem. They play a critical role in providing food and habitat for a variety of pollinators, and their unique adaptations allow them to survive in the harsh desert environment. By planting agaves in our gardens and landscapes, we can help support these important plants and the pollinators that rely on them.

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The Painted Lady butterfly begins its migration from Mexico and the southwestern United States, traveling up to 9,000 miles to reach Canada. The migration is a result of seasonal changes in temperature and vegetation, and it takes several generations of butterflies to complete the journey. This long-distance migration is an impressive feat, considering the size of the butterfly and the distance it covers.

Once the Painted Lady butterfly reaches the Sonoran desert, it begins its life cycle. The female butterfly lays her eggs on the leaves of specific host plants, including Yarrow (Achillea millefolia), Western Mugwort (Artemisia dracunculus), Arizona Thistle (Cirsium arizonicum), Desert Cotton (Gossypium thurberi), Globemallow (Sphaeralcea spp), Western Betony (Stachys coccinea) and Mexican Sunflower Bush (Tithonia fruticosa). The eggs hatch into caterpillars, which then feed on the host plants until they reach their full size. The caterpillar stage can last for several weeks before they are ready to pupate.

The pupa stage of the Painted Lady butterfly lasts for around ten days, during which the caterpillar transforms into an adult butterfly. The adult butterfly emerges from the pupa with its vibrant colors and striking patterns, ready to fly and explore its surroundings.

The Painted Lady butterfly is not picky when it comes to its diet. It feeds on a variety of nectar plants, including asters, yarrows, thistles, mallows and verbena. These nectar plants are essential for the adult butterfly to survive, as they provide the necessary nutrients for their energy and growth. Butterflies prefer mass plantings of nectar flowers; as a guideline, try to provide 3 sq ft groups of nectar or larval host plants.

The Painted Lady butterfly is an amazing insect with a unique life cycle and a long-distance migration. Its beauty and importance to the ecosystem of the Sonoran desert make it an exciting species to study and observe. So, the next time you spot a Painted Lady butterfly, take a moment to appreciate its remarkable journey and admire its stunning appearance.

See also, The Ladies and a Gentleman

First, let’s talk about the rain. The Sonoran Desert typically experiences two rainy seasons: the summer monsoon and the winter rains. While the summer monsoon is known for its dramatic thunderstorms and heavy downpours, the winter rains are more subtle and gentle. These rains may not be as impressive as the summer monsoon, but they are just as important for the growth of wildflowers.

During the fall and winter months, the desert landscape transforms into a sea of green as the winter rains trigger the germination of wildflower seeds that have been lying dormant in the soil. This is an exciting time for nature lovers, as the desert bursts into a riot of colors and shapes that are unique to this region.

Some of the most common wildflowers that bloom during the fall and winter months include the desert marigold, Mexican gold poppy, and lupine. These plants have adapted to the desert climate and can survive long periods of drought, but they rely on the winter rains to trigger their growth and bloom.

In addition to being a feast for the eyes, wildflowers play an important role in the ecosystem of the Sonoran Desert. They provide food and shelter for a variety of wildlife, from bees and butterflies to birds and mammals. They also help to prevent erosion and maintain soil health by keeping the soil in place and adding nutrients to the soil.

So, the next time you take a hike in the Sonoran Desert during the fall or winter months, keep your eyes peeled for the beautiful wildflowers that are in bloom. Take a moment to appreciate the role that these plants play in the ecosystem and the beauty that they bring to the desert landscape. And if you’re feeling adventurous, try your hand at identifying some of the different species that you see – who knows, you may just discover a new favorite!

You may see plants listed under a subshrub category; how can they be used in a pollinator garden?

A subshrub (Latin suffrutex) or dwarf shrub is a short shrub, and is a woody plant. Prostrate shrub is a related term. “Subshrub” is often used interchangeably with “bush“.^[1]

Because the criteria are matters of degree (normally of height) rather than of kind, the definition of a subshrub is not sharply distinguishable from that of a shrub; examples of reasons for describing plants as subshrubs include ground-hugging stems or low growth habit. Subshrubs may be largely herbaceous though still classified as woody, with overwintering perennial woody growth much lower-growing than deciduous summer growth. Some plants described as subshrubs are only weakly woody and some persist for only for a few years.

Wikipedia

Sub-shrubs are useful in a low desert pollinator garden for several reasons. Firstly, they are hardy and can survive in hot, dry conditions with little water, making them well-suited to the low desert environment. Secondly, they provide a source of nectar and pollen for pollinators such as bees, butterflies, and hummingbirds. Finally, sub-shrubs can be used as a border or filler plant in a pollinator garden, helping to create a diverse and visually appealing landscape.

In addition, sub-shrubs can be used in a variety of ways in a low desert pollinator garden. For example, they can be planted in clusters to create a mass of color that will attract pollinators. They can also be used to create a border around the edges of the garden or along pathways. Finally, sub-shrubs can be used to fill in gaps between larger shrubs or trees, creating a layered effect that provides shelter and food for a variety of pollinators.

The Sonoran Desert is a unique and diverse region that spans parts of California, Arizona, and Mexico. Here are some examples of plants that may be categorized as subshrubs, although some are woody and can get quite tall:

1. Agave spp
2. Baja Fairy Duster(Calliandra californica)
3. Blackfoot Daisy(Melampodium leucanthum)
4. Brittlebush (Encelia farinosa)
5. Burrobush(Ambrosia dumosa)
6. Catclaw Acacia(Senegalia greggii)
7. Colorado FourO’clock (Mirabilis multiflora)
8. Chuparosa (Justicia californica)
9. Desert Broom (Baccharis sarothroides)
10. Desert Globe Mallow (Sphaeralcea ambigua)
11. Desert Honeysuckle(Anisacanthus 
12. Desert Lavender (Hyptis emoryi)
13. Desert (Rush) Milkweed(Asclepias subulata)
14. Eastern Mojave Buckwheat(Eriogonum fasciculatum var. polifolium)
15. Parish’s Goldeneye(Bahiopsis parishii)
16. Pink Fairyduster(Calliandria eriophylla)
17. Penstemon spp 
18. Prairie Acacia(Acaciella angustissima)
19. Triangle Leaf Bursage (Ambrosia deltoidea)
20. Wright’s Buckwheat(Eriogonum wrightii)

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Elliott invited me to contribute to his post by sharing my story, so here we go…

Elliott, what a great journey, and thank you for inviting me to contribute to this post! Although it surprised me at first, it really makes sense that we share two pivotal influences in our path to recognizing and falling in love with the ecosystems that surround us: COVID and iNaturalist.

Although I’ve always had a love of gardening, starting with an indoor cactus garden in Cleveland, OH back in the 60s, my interest was broadened and intensified after moving back to Phoenix in 2019 after a 15 year hiatus. I signed up for a couple of courses at the Desert Botanical Garden Landscape School, although the second course was halted when COVID infections began escalating across the country.

And then a rather interesting post appeared in my fb feed: MetroPhoenix EcoFlora, an iNaturalist project coordinated by Jeny Davis at the Desert Botanical Gardens. Big changes start with a small step, and big events encourage change.

My first observation was a Hop Bush, which I then learned was a larval host plant for the Cincta Silkmoth, and things began to click.

Fast forward to 2021 – I had made thousands of plant observations, and developed a strong interest in the insects that visited the plants. And 2021 turned out to be a banner year for butterflies in Phoenix; what amazing fortune 🙂

I also found an opportunity to apply my background in training by developing A Visual Guide to Low Desert Butterflies and Moths.

Which then evolved into PollinatorWeb.com

So with a step, a journey began. A door opened and I stepped through, and got to know the plants and insects around me, and met some amazing people, some virtually and some in person!

In the low desert, tree pruning can be done almost year round, but here are the suggested best times to trim:

• Deciduous trees – winter dormancy (December through February)
• Citrus – after February to avoid frost damage
• Conifers – winter dormancy
• Natives – summer
  • Mesquites: Spring or early summer to prevent damage from monsoon storms
  • Palo Verdes: Avoid summer pruning since they are sun sensitive

Don’t forget to sanitize your pruning equipment before use, and in between pruning different trees to prevent virus, vascular fungus and bacteria infections. Don’t prune at oozing cankers. You can use:

• 70% isopropyl alcohol
• Listerine
• Lysol
• Pine-Sol

For more information on pruning:

• UofA Cooperative Extension
• KTAR

Last Saturday marked our first significant monsoon rainfall, measuring in at 1″, and neighboring parks allow us to observe how the desert has responded.

Although the above species has yet to be determined, tadpoles can hatch from eggs in as little as 15 hours, and develop into toads in a week.

[Couch’s Spadefoot toads] Their eggs have been known to hatch in just 15 hours, and they can complete the transformation from “tadpole to hopper” in as little as a week — assuming the puddle they are deposited in lasts that long.

In addition to the all-important moisture, amphibians are drawn out this time of year by another monsoon mainstay: flying ants. After a storm, Rosen said, swarms of the insects will emerge, touching off a feeding frenzy by frogs and toads.

Tucson.com

A number of toads and frogs call the Sonoran Desert home, including:

• Couch’s Spadefoot toad
• Red Spotted toad
• Mexican Spadefoot toad
• Great Plains toad
• Western Narrow-mouthed toad
• Sonoran Green toad
• Sonoran toad (toxic to dogs)
• Woodhouse’s toad
• American Bullfrog
• Lowland Leopard frog

Inconspicuous yellow-green flowers April-October depending on rainfall. Berries ripen July-December.

The edible berries are sweet to man and birds. Hermit Thrush, Northern Cardinal, towhees, Phainopepla, Townsend’s Solitaire, Cedar Waxwing, thrashers, White-crowned Sparrow and House Finch are among the birds likely to be seen at Desert Hackberry when in fruit.

Two fascinating butterflies use this plant as a larval host. The Leilia Hackberry Butterfly (Asterocampa leilia), burnt orange with black marginal spots, will almost always be found patrolling nearby up and down a wash just a few feet above the ground stopping frequently to perch on the ground.

…Another butterfly that feeds on hackberry as a caterpillar is the Snout Butterfly (Libytheana bachmanii), also colored burnt orange. The adult butterflies have a long snout formed from elongated palps (mouthparts), and unlike the hackberry butterflies, are avid nectar feeders especially at Seep Baccharis.

Arizonensis

Although you may initially assume that the months with the hottest average temperature pose the biggest threat to plants, other factors also contribute to plant stress levels.

Let’s look at a table of average weather in Phoenix:

So what factors affect plant stress during the hottest months?

• Daytime high temperature
• Nighttime low temperature
• Humidity
• Rainfall

June

Daytime temperatures break the century mark and may even soar into the 100+ degree zone. Low humidity, lots of sun and little rain make this an extremely challenging month, especially for non-desert adapted species. Cell damage can occur at about 115 degrees for broader leafed plants under these conditions. Applying extra water during June may not cure the stress because plants are not able to function at a level where they can overcome evapotranspiration.

In addition to low rainfall, deserts are characterized by a high rate of water loss from the ground (evaporation) and through plants (transpiration). Together this is called evapotranspiration. Potential evapotranspiration is the amount of water that would be lost through evaporation and transpiration if it were available.

What Is a Desert – DesertUSA

Protecting non-desert adapted plants with a 40% or 50% shade cloth will help, especially during the first year. Another helpful practice is to plant in fall instead of spring so there is more time for plants to get established.

July

The first couple of weeks can be similar to June, depending on when the Monsoon engine gets up and running. Rising humidity levels provide a break from the sun’s rays and allow plants to get a foothold against evapotranspiration.

Clear dry air transmits about 90% of available sunlight to the ground on a typical desert day compared to 40% in a typical humid climate.

What Is a Desert – DesertUSA

Cloudy days and rainfall also provide relief for stressed plants, resulting in new growth and flowering. Nighttime temperatures may be high enough to cause issues for CAM plants, resulting in root rot – this mostly affects non-Sonoran desert plants.

August

Monsoon continues through August. Average rainfall and nighttime lows are similar to July and average hours of sunshine fall by about 7%.

September

Monsoon officially ends September 30th, so humidity, clouds and rain may benefit plants throughout the month. If the days turn arid, though, high daytime temperatures can pose issues similar to June. Average daily temperatures are down a few degrees from June/July, hours of sunshine are down about 10% and rainfall averages begin to decline.

Butterflies are most active when it’s warm and when nectar sources are readily available. So what are the best months to observe butterflies in the Phoenix Sonoran Desert?

In Phoenix, Queens, Fiery Skippers and Gulf Fritillaries are usually around all summer. You can expect to see a showing of butterflies in the late winter into Spring, but the biggest show often comes in the months of August, September and October.

The three popular months coincide with Phoenix Monsoon and quite a number of blooming nectar plants. Following are some observations from the 2021/2022 calendar years in Phoenix. Note that 2021 was an amazing banner year for butterflies!

Some October Observations

Some November Observations

Some December Observations

Some January Observations

Some February Observations

Some March Observations

Some April Observations

Some May Observations

Some June Observations

Some July Observations

Family Bombyliidae (Bee Flies): A pollinator with a bad reputation. They are among the many flies that imitate bees, bumble bees specifically. By hovering, instead of landing, they avoid many predators hiding in the flowers.

Adults generally feed on nectar and pollen, some being important pollinators. Larvae generally are parasitoids of other insects, including bees. The adult females usually deposit eggs in the vicinity of possible hosts, quite often in the burrows of beetles or wasps/solitary bees.

Bee flies also facilitate pollination of many species of flowering plants. It is thought they are just as efficient pollinators of some types of flowers as are the bees and they are more frequent visitors so, in the end, they may a pollinate more flowers than bees.

Additional Resources:

• MetroPhoenix Ecoflora Ecoquest: Unfamiliar Pollinators
• US Forest Service: Bee flies
• Wikipedia: Bombyliidae
• Backyard Gardener: Bee Flies
• PollinatorWeb: Flies

The Sonoran Desert is bounded to the north by the Mogollon Rim, to the west by the southeastern corner of California and down into Baja California, and to the south by Sonora, Mexico.

There are over 250 species of butterflies in the Sonoran Desert. This rich butterfly diversity is due in part to the varied topography in this desert, which supports a wide variety of microclimates and plant distributions.

A significant number of butterflies are influx species, meaning they enter the Sonoran Desert from other deserts, thorn scrub habitats and mountain ranges. The combination of indigenous and influx species account for the high number of species and make for great butterfly watching.

Butterflies play important roles in the ecosystem. Their larval and adult forms are an important part of the food web and many help pollinate plants. Since they experience comparable environmental pressures and are easy to observe, butterflies are excellent bioindicators of environmental health.

For more information, and butterfly photos:

• PollinatorWeb Butterflies
• Desert Museum Butterflies
• McDowell Sonoran Conservancy
• Arizonensis Sonoran Desert Lepidoptera

Most of the news goes to the Honey Bee, a non-native European import, but there are about 1,000 species of native bees in the Sonoran Desert bioregion. And unlike the general bee stereotype, most native bees are solitary and don’t produce honey.

Whereas honey bees build honeycomb hives and live in large colonies, native bees, with the exception of bumble bees, are solitary and nest in the ground or in cavities like abandoned beetle holes in stems or twigs.

Because most native bees are solitary, it’s up to the female bee to build and provision the nest, and if the female dies, that generation is lost. As a result, native bees do not have the luxury of putting themselves at risk, and don’t sting unless absolutely necessary.

About Stings

Male bees don’t sting. Surprised? I was!

Stingers are actually modified ovipositors, which, once upon a time, were used by female bees to lay eggs, so only female bees can sting. (Male bees also don’t collect pollen, and this is one means of differentiating a male vs a female observation.)

Honey bees (female) are the only bees that die after stinging. Native female bees don’t leave their stinger behind, so they’re free to defend themselves multiple times if required.

Nesting Habits and Lending a Helping Hand in Your Garden

A bee nest contains anywhere from one to several dozen nest cells.

For bees that nest in the ground, a female bee digs the hole, typically in a sunny south or east patch of exposed earth. Providing patches in your garden that are away from traffic areas can provide nesting opportunities.

Native bees that don’t nest in the ground take advantage of pre-existing nest cavities, including hollowed out twigs, abandoned beetle burrows, tiny holes in bricks and even abandoned snail shells. There are many ways you can help make your garden a home, for example, by leaving snags (dead trees), not removing leaf litter until late spring, or providing nest cavities made of dead wood, dead stems or brush piles.

If you’re creating or modifying a pollinator garden in the low desert areas of Maricopa County and adjacent areas and want to help support native bees, a great set of guidelines and resources are provided by the Maricopa Pollinator Pathway project. Consider joining the project by adding your garden, it’s free! The Maricopa Pollinator Pathway Comprehensive Habitat FAQ is a great way to learn more about what makes a great pollinator habitat.

The Xerces Society also has great information about how to support ground nesting bees, cavity nesting bees and bumble bees.

Another great resource is The Bees in Your Backyard, by Joseph S. Wilson & Olivia Messinger Carril.

A hike in a Phoenix nature preserve today revealed very little in bloom, and consequently few native bees or butterflies.

Most of the Sonoran Desert native bees have just one generation per year, so, unlike the non-native Western Honeybee, many native bees will only be active and visible during the Spring or Summer wildflower blooms.

During my hike today, the only flowers I observed were on White Ratany, which was being visited by a bee species whose flower visits were so brief it would take an AI to get a photo,

California Barrel Cactus, whose flowers weren’t yet opened,

and Coues’ Senna, which had mainly gone to seed but still managed to produce flowers.

Native bees feed on pollen and nectar as well as flower oils for germicidal and bonding properties. Many are solitary, meaning they don’t belong to social hives, and make their nests and brood by burrowing into the ground or using tunnels in wood made by wood-boring beetles.

In my yard in North Phoenix, the native bees seem to have disappeared for a week or so before I wrote this post, so I figured they were gone for the season, even though there are plenty of Desert Marigolds, Zinnias, Sunflowers, Rush Milkweeds, Lantana and Desert Willows in bloom.

But then they reappeared. If native bees for the most part have only one generation per season, how can they be gone and then come back?

So I reached out to Elliott, our resident native bee contributor, and he had a bit of light to shed on the situation:

There’s a few things. Bet hedging, where not every egg hatches every year in case of droughts. Seasonality of host plants for sure and what else in the area is providing food that might be attracting them away from your yard. Pesticides and lack of suitable nesting habitat is a big urban problem. Also, there’s usually small bees going undetected by human observers due to their size and speed.

Elliott Gordon

In addition, I reached out to my friends in the Pollinator Gardening in the Southwest facebook group and asked what they are seeing in their yards.

The larger longhorn bees are active this month on Gaillardia pulchella flowers; Svastra obliqua and many Melissodes males and a few females of both species. The female Valley Carpenter Bees are still out every day. Lots of Triepeolus Cuckoo bees and Anthophora californica bees. The Svastra duplocincta time their June emerging with the neighbor’s Barrel Cactus flowering, which it has already and the males and females are now out and about in large numbers. Lots of activity in my Arizona garden even with the 111 degrees we had today. The number of Megachile bees are lower than usual this year, however. Wondering if the various cuckoo bees that showed up this year in greater numbers than previous were responsible.

Kim Neubauer, Phoenix West Side

I see gulf fritillary butterflies daily and occasionally giant swallowtails and queens. Lots of native bees, mainly sweat bees, leaf cutters, carpenter bees, and another that I haven’t identified.

MM, Central/Midtown Phoenix

A few Queens at the Mistflowers, weekly visit of Giant Swallowtails to the orange tree, a few Skippers at zinnias and Mexican Evening Primrose. Plus 3-4 species of native bees on the sunflowers, desert lavender, globe mallows, coreopsis, fairy duster & Superstition mallow.

MH, NE Phoenix

Phoenix temps 110. Not seeing too many  besides gulf fritillaries. Bees and wasp come around splashes in the pool to try and get water.

VC, Phoenix

A lot. At my fountain plants.

SBC, Phoenix

Plenty! My garden is full of yellow flowers and pollinators, but the wild spaces are brown and dry from lack of rain. I saw yard bee species 82 last weekend and yard moth/butterfly 100 last night.

Elliott Gordon, Albuquerque

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You can learn more about native bees at:

• Elliott’s Native Bee page on PollinatorWeb
• The Arizona-Sonora Desert Museum Bees page