Monarch Butterfly on a Narrow-Leaved Milkweed flower (Asclepias fascicularis).

Narrow-leaved milkweed flowering plants in a garden. Its scientific name is Asclepias fascicularis.

Green counties on this map indicate where Narrow-Leaved Milkweed (Asclepias fascicularis) is a native plant.

Chart showing seed package sizes that are available and how large an area each will plant. 1/4 ounce will plant 63 square feet, 1/2 ounce plants 125 square feet, and 1 ounce plants 250 square feet.

First year planting of Narrow-Leaved Milkweed (Asclepias fascicularis) grown from Stover seed.

First year planting of Narrow-Leaved Milkweed with a Monarch caterpillar on the plants. Asclepias fascicularis grown from Stover seed.

This is a Monarch butterfly chrysalis attached to a mess screen. In time, a butterfly will emerge.

Monarch Butterfly that just emerged from its chrysalis.

Older man with a Monarch Butterfly on his finger.

Painting of Monarch Butterflies and milkweed from 1797.

Milkweed, Narrow-Leaved

Asclepias fascicularis

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This Western US native flowering perennial has thin, erect stems and narrow, long pointed leaves. Drought tolerant too, Narrow-leaved Milkweed is a specific Monarch Butterfly food and habitat plant. This is the only type of plant on which the Monarch Butterfly eggs are laid and the colorful caterpillars (larvae) will feed. Each caterpillar will eventually change (via metamorphosis) into a gorgeous, iridescent green, jewel-like chrysalis that's flecked with golden speckles and later, a new Monarch Butterfly will emerge from the chrysalis. It's a fascinating process and with drastic declines in the Monarch Butterfly population you will be helping the species survive. So plant some Narrow-Leaved Milkweed seeds today and enjoy the show! Another common name for this species is "Mexican whorled milkweed".

Available in single packets and as bulk wildflower seeds.

Also see this helpful information:

Technical Guide: Establishment and Care of Wildflowers

Live seeds per ounce:	82,000
Seeding rate per ounce:	250 sq ft
Regions:	Western U.S. below 7,000 ft.
Native To:	Western U.S.
Life Cycle:	Perennial
Exposure:	Sun-Part Sun
Height (inches):	24-36
Bloom Period:	Spring-Summer
Flower Color(s):	White-Lavender
Germination Period:	Quick
Water Requirements:	Low

Cultural Information:	Plant seeds in groups to aid butterfly habitat

Caution: Milkweed contains naturally occurring toxicity. No part of the plant should be eaten or made into tea or medicine. Gardeners with pets or children with a propensity to eat plants should take this into consideration.

Milkweed, Narrow-Leaved

Live seeds per ounce:

82,000

Seeding rate per ounce:

250 sq ft

Regions:

Western U.S. below 7,000 ft.

Native To:

Western U.S.

Life Cycle:

Perennial

Exposure:

Sun-Part Sun

Height (inches):

24-36

Bloom Period:

Spring-Summer

Flower Color(s):

White-Lavender

Germination Period:

Quick

Water Requirements:

Low

Cultural Information:

Plant seeds in groups to aid butterfly habitat