Slim Milkweed

Asclepias linearis

Native to:
Mexico, United States

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Taxonomy

Division:
Magnoliophyta | - Flowering plants
Family:
Apocynaceae
Genus:
Asclepias
Species:
Asclepias linearis
USDA Symbol:
ASLI

Growth Characteristics

Life Cycle:
Perennial
Growth Habit:
Forb/herb , Subshrub
Height:
90 cm
Drought Tolerance:
High
Bloom Months:
may,jun,jul,aug,sep
Bloom Colors:
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

Queen butterfly (Danaus gilippus)

Reported Fauna Sightings

Butterflies:⚠️Monarch butterfly (Danaus plexippus)

Garden & Ecology Notes

Wildlife Value:
bees, butterflies, monarch butterflies
Deer Resistant:
Yes
Fragrant:
Yes
Fire Ecology:
Fire adapted — tolerates or benefits from fire
Fire Notes:
Plants can resprout from root crown after fire or top damage, showing tolerance to periodic burning in grassland and desert scrub habitats.

Soil Requirements

Soil Type:
sandy, well-drained, nutrient-poor soil
Drainage:
excellent drainage required
Moisture:
dry to moderate
Notes:
Native to arid and semi-arid regions

Propagation & Germination

Stratification:
Cold/moist stratification required — 30–60 days
Germination Time:
7–21 days
Notes:
Seeds require light for germination and should be surface sown or barely covered. 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).; then Cold-moist stratification for 60 days.

Notes: Seeds may require light for optimal germination.

Source: Claude AI

ORGHPS Germination Guide: Should not need chilling

Source: Ontario Rock Garden & Hardy Plant Society