Green Antelopehorn

Asclepias viridis

Native to:
United States

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Taxonomy

Division:
Magnoliophyta | - Flowering plants
Family:
Apocynaceae
Genus:
Asclepias
Species:
Asclepias viridis
USDA Symbol:
ASVI2

Growth Characteristics

Life Cycle:
Perennial
Growth Habit:
Forb/herb
Height:
60 cm
Light Requirements:
Full Sun
Drought Tolerance:
High
Bloom Months:
may,jun,jul
Bloom Colors:
green, white, cream

Wildlife Benefits

Bees:
★☆☆☆☆ Documented bee visitation (GBIF)
Butterflies & Moths:
★☆☆☆☆ Documented Lepidoptera association (GBIF)
Caterpillars:
★☆☆☆☆ Recorded caterpillar host plant (HOSTS Database)

Keystone Species Ranking

Caterpillar Keystone:
★★☆☆☆ Butterfly & moth species supported by this genus (NWF)

Host Plant for Caterpillars

⚠️Monarch butterfly (Danaus plexippus)

Reported Fauna Sightings

Bees: American bumble (Bombus pensylvanicus), Brown-belted bumble (Bombus griseocollis), Eastern Carpenter Bee (Xylocopa virginica), Southern plains (Bombus fraternus), ⚠️Western honey bee (Apis mellifera) Moths:Cycnia collaris Butterflies:Gray Hairstreak (Strymon melinus), ⚠️Monarch butterfly (Danaus plexippus), Queen butterfly (Danaus gilippus)

Garden & Ecology Notes

Wildlife Value:
butterflies, bees, monarch butterflies, native bees
Deer Resistant:
Yes
Fragrant:
Yes
Fire Ecology:
Fire adapted — tolerates or benefits from fire
Fire Notes:
Resprouts vigorously from deep roots after fire. Common in fire-maintained prairies and benefits from periodic burning which reduces woody competition.

Soil Requirements

Soil Type:
well-drained, sandy or rocky soil
pH:
6.0 - 7.5 (slightly acidic to neutral)
Drainage:
excellent drainage required
Moisture:
dry to moderate
Notes:
native to prairies and open woodlands

Propagation & Germination

Stratification:
Cold/moist stratification required — 30–60 days
Germination Time:
7–21 days
Notes:
Seeds require light for germination. Surface sow or barely cover. Fresh seed germinates more readily than stored seed.

The above propagation data sourced from Claude AI

Pre-treatment: Cold-moist stratification for 30 days at 1–5°C (34–41°F).

Notes: Seeds require light for germination; do not cover.

Source: Claude AI

ORGHPS Germination Guide: Should not need chilling

Source: Ontario Rock Garden & Hardy Plant Society