Small garden, no problem, no garden, plant in pots! In urban settings, small contributions can have significant benefits to Pollinators.
“The types of plants that gardeners chose to grow did matter, however. The researchers found that shrubs provided 58 percent of nectar, since they condense many flowers into a smaller space. Daisies were also helpful plants for pollinators because they have an open shape that even insects with short tongues can access easily…”
“The diversity you get in urban areas is remarkably high, much higher than most natural habitats, even nature reserves,” Tew told The Guardian. “It’s unlikely for two gardens to have exactly the same species of plants, so together gardens create much richer nectar resources than they do individually.”