Photo by Melody

PlantFiles: Aquatic Milkweed, White Milkweed
Asclepias perennis

Family: Apocynaceae (a-pos-ih-NAY-see-ee) (Info)
Genus: Asclepias (ass-KLE-pee-us) (Info)
Species: perennis (per-EN-is) (Info)

Synonym:Asclepias lancifolia
Synonym:Asclepias parviflora
Synonym:Asclepias parvula
Synonym:Asclepias pulchella

One vendor has this plant for sale.

8 members have or want this plant for trade.


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)

Sun Exposure:
Full Sun

All parts of plant are poisonous if ingested

Bloom Color:
White/Near White

Bloom Time:
Late Winter/Early Spring
Mid Spring
Late Spring/Early Summer
Mid Summer
Late Summer/Early Fall
Mid Fall
Blooms repeatedly

Grown for foliage

Other details:
Average Water Needs; Water regularly; do not overwater
Requires consistently moist soil; do not let dry out between waterings

Soil pH requirements:
5.1 to 5.5 (strongly acidic)
5.6 to 6.0 (acidic)
6.1 to 6.5 (mildly acidic)
6.6 to 7.5 (neutral)

Patent Information:

Propagation Methods:
By dividing rhizomes, tubers, corms or bulbs (including offsets)
From seed; direct sow outdoors in fall
From seed; winter sow in vented containers, coldframe or unheated greenhouse
From seed; stratify if sowing indoors

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

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By Floridian
Thumbnail #1 of Asclepias perennis by Floridian

By Floridian
Thumbnail #2 of Asclepias perennis by Floridian

By Floridian
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By Equilibrium
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1 positive
2 neutrals
No negatives

Gardeners' Notes:

Neutral frostweed On Nov 30, 2006, frostweed from Josephine, Arlington, TX (Zone 8a) wrote:

Aquatic Milkweed, White Milkweed Asclepias perennis is native to Texas and other States.

Positive WillisTxGarden On Sep 12, 2006, WillisTxGarden from Willis, TX (Zone 8b) wrote:

Attracts butterflies is main positive...needs the soil to remain moist since it has adapted to growth in such an environment. I collected my seeds from a plant growing in some wetlands near the Sabine River in Texas.

Neutral lupinelover On Jan 29, 2003, lupinelover from Grove City, OH (Zone 6a) wrote:

Native to swamps and wetlands. Wide-spread through North America.


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

Bartow, Florida
Green Cove Springs, Florida
Lutz, Florida
Ocean Springs, Mississippi
Willis, Texas
Leesburg, Virginia

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