Quick answer: Narrowleaf milkweed (Asclepias fascicularis) is native to 6 states. What's commonly sold under this name is the true wild species. It's typically live plant, verified 24 Oct 2026.
Photo: Eric Hunt, Wikimedia Commons (CC BY-SA 3.0)
Where it's native
Listed in the directory as native to these states. Click a state for its full native-plant guide.
Growing conditions
From the Lady Bird Johnson Wildflower Center Native Plant Database.
| Sun | Sun |
|---|---|
| Water | Dry-Medium |
| Soil | Clay or loam |
| Bloom | Bloom Jun-Sep |
| Height | 1-3 ft |
| Wildlife value | Monarch host, bees |
Milky sap toxic if eaten; keep from livestock
Buying it
Sold true to the wild species as of the last check (24 Oct 2026), via Amazon.
Sold as: Live plant via Amazon · listing verified 24 Oct 2026
See where to buy →Quick answers about Narrowleaf milkweed
Where is Narrowleaf milkweed native?
Narrowleaf milkweed (Asclepias fascicularis) is native to California, Idaho, Nevada, Oregon, Utah and Washington. Check your state's page in this directory for the full list of plants native where you live.
When does Narrowleaf milkweed bloom?
Narrowleaf milkweed blooms Jun-Sep. Exact timing shifts a few weeks with latitude and elevation.
What growing conditions does Narrowleaf milkweed need?
Light: Sun. Water: Dry-Medium. Soil: Clay or loam. Mature height: 1-3 ft.
Is Narrowleaf milkweed good for pollinators and wildlife?
Yes. Wildlife value: Monarch host, bees.
Is Narrowleaf milkweed deer-resistant or drought-tolerant?
Narrowleaf milkweed is deer-resistant and drought-tolerant.
Is Narrowleaf milkweed toxic?
Milky sap toxic if eaten; keep from livestock.
Where can I buy real Narrowleaf milkweed seed or plants?
We found a listing sold as live plant that names the true species, last checked 24 Oct 2026. Look for the scientific name Asclepias fascicularis on any listing.
Similar native plants
Native plants that share growing conditions or range with Narrowleaf milkweed.
- Royal penstemon Penstemon speciosus
- Purple sage (desert sage) Salvia dorrii
- Showy milkweed Asclepias speciosa
- Munro's globemallow Sphaeralcea munroana
- California poppy Eschscholzia californica
- Brittlebush Encelia farinosa
Also listed under
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