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(Asclepias fascicularis)
Narrow-leaf Milkweed

Host Plant: Monarch Butterfly (Danaus plexippus) and Queen Butterfly (Danaus gilippus)

Nectar Plant: Monarchs, and other butterflies and insects

Flower Color: Lavender-white

Growth Habit: herbaceous perennial that grows 1 to 3 feet tall

Range in North America: Western United States

Exposure: Full sun

Hardiness: Zones 6-10

Soil Requirements: dry soils

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Narrow-leaf Milkweed (Asclepias fascicularis)

Plant of narrow-leaf milkweed (Asclepias fascicularis) in a desert.
Narrow-leaf Milkweed (Asclepias fascicularis) Decne.
observed in United States of America
by Lauren Gill (licensed under CC0 1.0)

Alternative Names

Mexican whorled Milkweed and Narrow-leaved Milkweed

Description of Narrow-leaf Milkweed (Asclepias fascicularis)

Narrow-leaf milkweed (Asclepias fascicularis), a member of the Apocynaceae (Dogbane Family), is a herbaceous perennial that grows from 1 to 3 feet tall and has lavender-white flowers that bloom from spring through fall (roughly April to September, depending on location).  The leaves are simple, opposite to whorled, entire, linear to lanceolate in shape, and are up to 6 inches in length and 0.75 inches wide.  This plant grows in hardiness zones 6-10 and likes open areas with full sun that have dry soils.  More information about narrow-leaf milkweed can be found on this blog post.

Hosted Species

Monarch Butterfly (Danaus plexippus)

Monarch Butterfly (Danaus plexippus) on orange flower.
ALAN SCHMIERER from southeast AZ, USA, CC0, via Wikimedia Commons

Queen Butterfly (Danaus gilippus)

Queen Butterfly (Danaus gilippus) on a branch.
Korall, CC BY 3.0, via Wikimedia Commons

Nectar Species

Other butterflies, bees, and hummingbirds use this plant as a nectar source.

Range of Narrow-leaf Milkweed (Asclepias fascicularis) in the United States and Canada

Range map of narrow-leaf milkweed (Asclepias fascicularis) in the United States and Canada.

Interesting Facts

The genus name, Asclepias, is the Greek name for the God of Medicine.  The species name, fascicularis, is Latin for “bundles,” referring to the leaves.

Native Location

California, Idaho, Nevada, Oregon, Washington

USDA Plant Hardiness Zone

Zone 6, Zone 7, Zone 8, Zone 9, Zone 10

Exposure Requirements

Full Sun

Plant Habit


Soil Requirements


Hosted Species

Danaus gilippus (Queen), Danaus plexippus (Monarch)


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Narrow-leaf Milkweed”

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