Asclepias californica is an important
monarch butterfly caterpillar host plant, and chrysalis habitat plant. The
cardiac glycosides caterpillars ingest from the plant are retained in the butterfly, making it unpalatable to predators.
Asclepias californica attracts a wide variety of pollinators including bees and other butterfly species. Its flowers are rich in nectar, providing a critical food source for various insects as well as serving as shelter; contributing greatly to the overall pollinator health in the region. ==Uses==