Great Design Plant: Green Antelopehorn (Asclepias viridis) - A Well-Behaved Milkweed

Among 100+ North American milkweeds, green antelopehorn (Asclepias viridis)—also called spider milkweed—stands out: adaptable, drought-tolerant, compact (1–2 ft), and non-aggressive. This central/southern Great Plains native blooms earlier than most milkweeds, offering unique flowers for pollinators and critical monarch habitat.

Aubrey James Shepherd

Caution: All parts are poisonous.

Quick Facts

• Zones: 5–9 (–20°F / –29°C)
• Size: 1–2 ft tall and wide
• Light: Full sun
• Water: None needed once established; prefers dry to medium soil
• Soil: Sandy, rocky, or clay-loam; well-drained
• Habitat: Meadow, prairie (tallgrass/mixed-grass ecoregions)
• Plant: Spring–early fall (potted/bare-root); sow seeds late fall–midwinter

Aubrey James Shepherd

Distinctive Traits

• Foliage: Leaves curl, cup, or wave distinctively.
• Bloom time: Late spring to early summer—earlier than most milkweeds, useful for bloom succession.
• Flowers: Elegant, subtly unique structure.
• Behavior: Non-aggressive; single flower stalk per plant (may take years to bloom while establishing deep taproot).

Aubrey James Shepherd

Design Uses

• Front of border or among short plants where blooms rise above neighbors.
• Pairs beautifully with airy shortgrasses: little bluestem (Schizachyrium scoparium), sideoats grama (Bouteloua curtipendula), native sedges (Carex spp.).
• Avoid tall companions (>2 ft) and crowding—prefers less competition.

Aubrey James Shepherd

Planting Notes

• Dry, well-drained soil essential. Ideal for harsh slopes/plains in full sun.
• Not aggressive—plays well with others.
• Monarch magnet—caterpillars often visible on plants.

Host for monarchs, milkweed beetles, bugs, tussock moths, and more.