Photo by Melody

PlantFiles: Narrow-Leaf Milkweed, Mexican Whorled Milkweed
Asclepias fascicularis

Family: Apocynaceae (a-pos-ih-NAY-see-ee) (Info)
Genus: Asclepias (ass-KLE-pee-us) (Info)
Species: fascicularis (fas-sik-yoo-LAIR-iss) (Info)

Synonym:Asclepias fasciculata
Synonym:Asclepias mexicana

One vendor has this plant for sale.

9 members have or want this plant for trade.


24-36 in. (60-90 cm)
36-48 in. (90-120 cm)

18-24 in. (45-60 cm)
24-36 in. (60-90 cm)

USDA Zone 6a: to -23.3 C (-10 F)
USDA Zone 6b: to -20.5 C (-5 F)
USDA Zone 7a: to -17.7 C (0 F)
USDA Zone 7b: to -14.9 C (5 F)
USDA Zone 8a: to -12.2 C (10 F)
USDA Zone 8b: to -9.4 C (15 F)
USDA Zone 9a: to -6.6 C (20 F)
USDA Zone 9b: to -3.8 C (25 F)
USDA Zone 10a: to -1.1 C (30 F)
USDA Zone 10b: to 1.7 C (35 F)

Sun Exposure:
Full Sun

All parts of plant are poisonous if ingested

Bloom Color:
Pale Green
White/Near White

Bloom Time:
Mid Summer
Late Summer/Early Fall


Other details:
This plant is attractive to bees, butterflies and/or birds
Average Water Needs; Water regularly; do not overwater

Soil pH requirements:
6.1 to 6.5 (mildly acidic)
6.6 to 7.5 (neutral)
7.6 to 7.8 (mildly alkaline)
7.9 to 8.5 (alkaline)

Patent Information:

Propagation Methods:
From seed; direct sow outdoors in fall

Seed Collecting:
Bag seedheads to capture ripening seed
Allow pods to dry on plant; break open to collect seeds

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4 positives
No neutrals
1 negative

Gardeners' Notes:

Positive montsho On Jun 17, 2013, montsho from Tracy, CA (Zone 9b) wrote:

This plant grows under some extreme conditions and seems to like sun, heat, drought and high wind. It grows at the edge of open fields near the road in my area. It is easy to kill with too much water so water regularly for about a week or 2 to get settled then leave it alone!

Positive TnWren On Sep 9, 2011, TnWren from Evening Shade, AR (Zone 7a) wrote:

It is a native wildflower here in the foothills of the Ozarks and I am glad to have it for the butterflies and bees who enjoy it.
It's growing in rocky, acidic soil in partilal shade and appears to be very drought and heat tolerant.
It doesn't appear to be invasive here and I plan on harvesting more seed this year and planting it out around the property.

Positive CBernard On Nov 11, 2008, CBernard from Perris, CA (Zone 9a) wrote:

I have been growing this asclepias for three years now. It does spread quite rapidly. However, that is no problem when you consider how many butterfly species that the larva feed on this plant (besides Monarchs). It depends on what your objectives are.

Positive Ficurinia On Jul 18, 2008, Ficurinia from Portland, OR wrote:

I bought this plant a few years ago and it is only just beginning to bloom this year. Planted in the drought-tolerant area in my garden, its leaves blend in well with the other plants, and the blooms are amazing.

Negative Scorpioangel On Jun 14, 2006, Scorpioangel from Gold Hill, OR (Zone 7a) wrote:

This roadside 'weed' is invasive and very hard to get rid of once a stand is started. The only plus for this plant is the fact that it is food for Monarch's.


This plant has been said to grow in the following regions:

Evening Shade, Arkansas
Agoura Hills, California
Brentwood, California
Laguna Beach, California
Long Beach, California
Los Angeles, California
Malibu, California
Perris, California
Richmond, California
San Marcos, California
Tracy, California
Gold Hill, Oregon
Portland, Oregon
Kerrville, Texas

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