Photo by Melody

PlantFiles: Swamp Milkweed
Asclepias incarnata 'Soulmate'

Family: Apocynaceae (a-pos-ih-NAY-see-ee) (Info)
Genus: Asclepias (ass-KLE-pee-us) (Info)
Species: incarnata (in-kar-NAH-tuh) (Info)
Cultivar: Soulmate

16 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 3a: to -39.9 C (-40 F)
USDA Zone 3b: to -37.2 C (-35 F)
USDA Zone 4a: to -34.4 C (-30 F)
USDA Zone 4b: to -31.6 C (-25 F)
USDA Zone 5a: to -28.8 C (-20 F)
USDA Zone 5b: to -26.1 C (-15 F)
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:

Bloom Time:
Mid Summer
Late Summer/Early Fall


Other details:
This plant is attractive to bees, butterflies and/or birds
Requires consistently moist soil; do not let dry out between waterings

Soil pH requirements:
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:
Allow pods to dry on plant; break open to collect seeds
Properly cleaned, seed can be successfully stored

Click thumbnail
to view:

By Marilynbeth
Thumbnail #1 of Asclepias incarnata by Marilynbeth

By Marilynbeth
Thumbnail #2 of Asclepias incarnata by Marilynbeth

By Marilynbeth
Thumbnail #3 of Asclepias incarnata by Marilynbeth

By Marilynbeth
Thumbnail #4 of Asclepias incarnata by Marilynbeth

By Marilynbeth
Thumbnail #5 of Asclepias incarnata by Marilynbeth

By Marilynbeth
Thumbnail #6 of Asclepias incarnata by Marilynbeth

By SW_gardener
Thumbnail #7 of Asclepias incarnata by SW_gardener

There are a total of 12 photos.
Click here to view them all!


4 positives
1 neutral
No negatives

Gardeners' Notes:

Positive themikesmom On Mar 15, 2013, themikesmom from Concord, NC wrote:

Very lovely plant! It's tall but not as tall as Brazilian verbena so just planted it infront of one and the two go great together and they are both super butterfly magnets. We first saw this plant and wanted it a few years ago and came back to get it and it was sold out and luckily we just found it again and got the last one, its hard to find so if you see one get it for your garden.

Positive Marilynbeth On Nov 18, 2006, Marilynbeth from Hebron, KY wrote:

Beautiful, I love it!

First Milkweed, but not my last! I love offering plants and flowers for the BF's and their 'Cats'.

Positive debi_z On Aug 26, 2006, debi_z from Springfield, MA (Zone 6a) wrote:

i had 3 volunteer seedlings from this plant. they were close together and i left one which matured quickly and left me with 1 limb. the next spring it had two, then three and then a new home. i found this plant to grow quite rapidly. i unfortunately have not seen a lot of caterpillars visiting mine, but there are 3 monarchs this year that are visiting the adult blossoms. this is 2 more monarchs than the last few years.

i was deceived when purchasing this, in my mind i saw a perennial plant and it developed into what i see as more of a medium size bush, like the life cycle of the butterfly bush or the hardy hibiscus.

the "milk" refers to the white fluid that comes out when you cut the stems.

Positive trailingon On Nov 18, 2005, trailingon from dobie, ON (Zone 3a) wrote:

When I bought this plant this spring, it was just a tiny stick. Grew fast and bloomed for a long time. Seed heads must be allowed to mature on the plant and harvested just when they are starting to split. Seeds collected germinated well.

Neutral echoes On Sep 8, 2003, echoes from South of Winnipeg, MB (Zone 3a) wrote:

This plant was easy to start from seed. First year plants have taken off well and are blooming in September. Even when they were about 10 inches high the Monarchs laid their eggs on them.


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

Lockport, Illinois
Mount Prospect, Illinois
Palmyra, Illinois
Westmont, Illinois
Barbourville, Kentucky
Hebron, Kentucky
Amesbury, Massachusetts
Springfield, Massachusetts
Adrian, Michigan
Royal Oak, Michigan
Concord, North Carolina
New Freedom, Pennsylvania
Norristown, Pennsylvania
Eagle, Wisconsin

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