Baja Spurge is a fast growing tall bamboo like shrub that in my yard has frequently been mistaken for milkweed because of it's green pencil like stems. Spreading through rhizomes and self-seeding it can form a large dense stands. The fragrant small white to pink flowers are attractive to hummingbirds, bees and butterflies. Native to sea bluffs, dunes, rocky washes and slopes in central to southern Baja California and coastal Sonora. In it's native habitat the flowering season occurs after the winter rain season. 
Stems are sensitive to frost damage at about 20 degrees but the roots are much more hardy.