Desert Milkweed

Asclepias erosa

Native to:
Mexico, United States

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Taxonomy

Division:
Magnoliophyta | - Flowering plants
Family:
Apocynaceae
Genus:
Asclepias
Species:
Asclepias erosa
USDA Symbol:
ASER2

Growth Characteristics

Life Cycle:
Perennial
Growth Habit:
Forb/herb , Subshrub
Height:
100 cm
Light Requirements:
Full Sun
Drought Tolerance:
High
Bloom Months:
may,jun,jul,aug
Bloom Colors:
cream, yellow, pink

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), Queen butterfly (Danaus gilippus)

Reported Fauna Sightings

Butterflies:⚠️Monarch butterfly (Danaus plexippus), Queen butterfly (Danaus gilippus)

Garden & Ecology Notes

Wildlife Value:
monarch butterflies, bees, other butterflies
Deer Resistant:
Yes
Fragrant:
Yes
Fire Ecology:
Fire adapted — tolerates or benefits from fire
Fire Notes:
Resprouts vigorously from root crown after fire. Common in fire-prone chaparral and coastal sage scrub communities.

Soil Requirements

Soil Type:
sandy, well-drained, nutrient-poor soil
pH:
6.0 - 8.0 (neutral to slightly alkaline)
Drainage:
excellent drainage required
Moisture:
dry to moderate
Notes:
Commonly found in arid desert regions

Propagation & Germination

Stratification:
Cold/moist stratification required — 30–60 days
Germination Time:
7–21 days
Notes:
Seeds germinate best with light exposure. Sow on surface or barely cover.

The above propagation data sourced from Claude AI

Pre-treatment: Cold-moist stratification for 30 days at 1–5°C (34–41°F).; then Scarify, then cold-moist stratify for 60 days.

Source: Claude AI

ORGHPS Germination Guide: Should not need chilling

Source: Ontario Rock Garden & Hardy Plant Society