Euphorbia tirucalli 

Great container or accent plant, the tips turn orange-ish red when weather turns cold. Other common names include Sticks of Fire and Pencil Tree.

Flowers: J F M A M J J A S O N D
Status: Non-native
Origin: Native to South Africa, though it has naturalized throughout Africa. Also it has naturalized in southwest Florida.
Family: Euphorbiaceae
Size: To 20′ in the ground, much smaller in containers
Sun: Full
Watering: Low
Growth Rate: Fast
Soil: Tolerates a variety of soil types
Temperature: Hardy into the mid-20s F
Disease and Pests:
Uses: Nectar plant for bees
Notes: The stems contain white latex that might be toxic and can cause dermal rashes and blistering, oral ingestion might cause nausea, vomiting, diarrhea. The tiny yellow flowers might be missed by humans, but bees and other pollinators love them.