Growing Zones
5*-9
Light
Full Sun
Duration
Perennial
Size
~1-2 ft
Antelope Horn Milkweed (Asclepias asperula), a hardy and captivating native plant widespread throughout the Southwestern United States and parts of Mexico, is emerging as a critical component of both ecological systems and butterfly conservation. Antelope Horn Milkweed, with its unique narrow leaves and exquisite clusters of blooms, is a symbol of beauty in dry regions. However, its value extends beyond aesthetics, as this species provides a critical habitat and food source for a variety of butterfly species, including the charismatic monarch butterfly. Asclepias asperula’s complex relationship with butterflies goes beyond mere nutrition; it also plays an important role in their life cycle, acting as a nursery for caterpillars and a shelter for adult butterflies looking for nectar-rich blossoms.
*I have found mixed information on the growing zones. Some sources say zones 5 to 9, while others say zones 7 to 9.
Names:
Scientific Name: Asclepias asperula
Plant Family: Apocynaceae
Other Names: Antelope-Horns Milkweed, Spider Milkweed, Green-Flowered Milkweed, Spider Antelope-Horns
Native range:
AZ , CA , CO , ID , KS , NE , NM , NV , OK , TX , UT
Bloom Information:
Bloom Color: Green to cream coloring, with purple highlights in the center.
Bloom Time: Spring, Summer
Requirements
Water Needs: Low, Average
Soil Drainage: Dry to medium well drained soils
Soil Type: Chalk, Clay, Loam, Sand
Soil pH: Acidic, Alkaline, Neutral
Considerations:
Monarch caterpillars are veracious eaters, so plant more than you think you will need!
