Antelope Horn Milkweed Seeds for Butterfly Gardens
Asclepias asperula has several common names such as Antelope Horns Milkweed, Green-flowered Milkweed, and Spider Milkweed. (The term “Spider Milkweed” is also used for Asclepias viridis). It is a low, sprawling southwestern native.
Antelope Horn Milkweed feeds Soldier Butterfly caterpillars and Queen Butterfly caterpillars as well as the Monarchs. Adult butterflies and other pollinators enjoy the nectar from the flowers.
Characteristics of Asclepias asperula
Like Green milkweed, Antelope Horn Milkweed appears early in the spring to provide food for early migration Monarchs. The flowers have a green-cream coloring with purple highlighting in the center. Asclepias asperula is an herbaceous perennial, hardy in zones 5-9.
With a taproot, this milkweed is drought tolerant and non-aggressive. It is commonly found in sandy or rocky, well-draining soil, preferring dry to medium moisture. Green-flowered milkweed needs full sun.
Many blooming stems can come from the same plant. When the seed pods form, looking like antelope horns, it can be said that a field of these plants resembles a field full of antelope!
Starting Antelope Horn Milkweed Seeds
Antelope Horn milkweed seeds will germinate best after 30 days of cold stratification to break dormancy. After stratification, plant about 1/8″ deep at room temperature and kept them moist. The seeds can be fall planted, winter sown, or planted in the spring (indoors or out) after cold-stratification. Warm temperatures (70 F) help with germination.
Antelope Horn Milkweed helps with early Monarch migration and is a robust milkweed for Southwestern native planting!