Asclepias angustifolia, or Arizona Milkweed, grows up to 2 ft tall in riparian woodlands, canyons, and mountains between 3500-7500 ft in elevation. Its clusters of white flowers can be seen in bloom between September-June. This is a host plant for monarch and queen butterfly larvae. Transplants well due to its fibrous root system. Plant in clay or silty soils. Tolerates a wide variety of conditions, but performs the best in partial shade.