Antelope Horns? I know that one well.

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Antelope Horns

Asclepias asperula

Zones 6–13

Growing

Establishing this native perennial is most successful when you provide well-draining soil that stays relatively dry, as it thrives in low-water conditions. If you choose to start your plants indoors, ensure they are transplanted into a location that receives plenty of sunlight. Because this species naturally spreads by dropping its own seeds, you may notice new seedlings appearing near the parent plant in the garden.

As a single upright stem, this milkweed is an excellent choice for containers or sunny garden borders where it can act as a nectar station. The flowers feature a complex structure where pollen is not loose, but instead travels in specialized masses. When pollinators like bees, butterflies, or beetles visit the nectar at the base of the hoods, they often inadvertently snag their legs in the floral slits. This mechanism is essential for the plant's reproduction, as the insect carries the pollen mass to the next flower.

When managing this plant in your landscape, remember that it is a vital resource for various insects, including moths and flies. While it is a hardy addition to your garden that can survive hard freezes, keep in mind that all parts of the plant are toxic to people, pets, and livestock.

Stats
Sunfull sun
Waterlow
Grow time—
Height1–3ft
Spacing12–24in
Light
Full sun✓
Part shade✓
Shade✗
Traits
Life cycleperennial
Categorywildflower
Growth habitupright
Frost tolerancehardy
Height1–3ft
Spacing12–24in
Days to bloomover 150
Native us✓
Growing
Waterlow
Drainagewell drained
Soil ph min6.0
Soil ph max7.5
Propagation
Seed✓
Cutting✗
Division✓
Graft✗
Tuber bulb crown✗
Transplant✓
Container ok✓
Spreadself seeds
Deer resistant✓
Drought tolerant✓
Toxic to
People✓
Pets✓
Livestock✓
Bloom
Length2–6wk
Colors
White✗
Yellow✓
Orange✗
Red✗
Pink✗
Purple✗
Blue✗
Green✗
Pollinators
Visitors
Honey bees✓
Native bees✓
Bumblebees✓
Butterflies✓
Moths✓
Hummingbirds✗
Beneficial insects✓
Nectarmedium
Pollenlow
Larval host✓
Specialist bees✓
Seed for birds✓
Invasive
Statusnone
Regions
Northeast✗
Southeast✗
Midwest✗
Plains✗
Southwest✗
Mountain west✗
Pacific northwest✗
California✗
Hawaii✗
State noxious✗
Escapes cultivation✗
Calendar, zone 7
JanFebMarAprMayJunJulAugSepOctNovDec
Sownonoyesyesyesnonononononono
Harvest————————————