General Plant Information (Edit)
Plant Habit: Herb/Forb
Life cycle: Perennial
Sun Requirements: Full Sun
Full Sun to Partial Shade
Water Preferences: Wet
Wet Mesic
Soil pH Preferences: Strongly acid (5.1 – 5.5)
Moderately acid (5.6 – 6.0)
Slightly acid (6.1 – 6.5)
Neutral (6.6 – 7.3)
Minimum cold hardiness: Zone 3 -40 °C (-40 °F) to -37.2 °C (-35)
Maximum recommended zone: Zone 9b
Plant Height: 24 - 48 inches
Plant Spread: 18 - 24 inches
Leaves: Other: Plants have a cluster of fleshy roots radiating outwards and are best left undisturbed once established. Foliage is slow to emerge in spring. It typically grows 3-4' tall (less frequently to 5') on branching stems. Stems exude a toxic milky sap when cut.
Flowers: Showy
Flower Color: Mauve
Other: reflexed pink petals under/surrounding whitish hoods
Bloom Size: Under 1"
Flower Time: Late spring or early summer
Late summer or early fall
Underground structures: Rhizome
Suitable Locations: Bog gardening
Uses: Water gardens
Will Naturalize
Wildlife Attractant: Bees
Resistances: Deer Resistant
Rabbit Resistant
Flood Resistant
Humidity tolerant
Toxicity: Leaves are poisonous
Roots are poisonous
Other: Bitter tasting
Propagation: Seeds: Provide light
Self fertile
Stratify seeds: Needs 1 month cold moist treatment.
Suitable for wintersowing
Can handle transplanting
Propagation: Other methods: Division
Pollinators: Wasps
Moths and Butterflies
Containers: Not suitable for containers

Common names
  • Swamp Milkweed
  • Pink Milkweed
  • Rose Milkweed
  • Red Milkweed
  • Swamp Silkweed
  • White Indian Hemp
  • Milkweed

This plant is tagged in:
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  • Posted by Catmint20906 (PNW WA half hour south of Olympia - Zone 8a) on Aug 8, 2014 2:38 PM concerning plant:
    Swamp Milkweed (Asclepias incarnata) is a larval host plant for the Monarch and Queen butterflies, and is a Monarch Way Station plant.

    This plant has special value to native, bumble, and honey bees, including yellowfaced, sweat, green sweat, small resin, and leafcutter bees.

    Swamp Milkweed (Asclepias incarnata) also supports conservation biological control by attracting beneficial insects which consume a variety of common garden pests.
  • Posted by flaflwrgrl (North Fl. - Zone 8b) on Feb 25, 2015 7:28 PM concerning plant:
    Native to every state in the U.S., except California, Arizona, Washington, Oregon, and Mississippi. Also native to Ontario, Manitoba, and Quebec provinces in Canada.
    This is not an aggressively spreading milkweed. It blooms later than many milkweeds, which makes it a great candidate for extending the milkweed season.
    This is both a nectar plant as well as host plant for the endangered Monarch butterfly, so it feeds the caterpillars as well as the adults.
    Milkweeds are fantastic for the monarch butterfly population.
    This is a milkweed that likes moisture, and the leaves are thin and will tend to dry out rather quickly if they are picked to feed Monarch caterpillars if you are trying to raise them.
    This also attracts many other butterflies, bees, hummingbirds, and moths.
  • Posted by Chillybean (Iowa - Zone 5a) on Jul 30, 2015 12:38 PM concerning plant:
    The Swamp Milkweed was one of my first native plants; put in a wet spot in our yard in spring 2012 as seedlings. Later that summer it was covered in the non-native Oleander Aphids. To my surprise, they came up the next spring and even bloomed, but that was the last I saw of them.

    What a surprise! In a drier area of our yard, some came up this spring (2015). I sowed seeds in that patch in 2013 and they must've taken that long to germinate. There are three plants and they all have flowers! Monarch eggs have already been laid and the larvae are consuming this. So far, no sign of the aphids, but I check the plants regularly.
  • Posted by SongofJoy (Clarksville, TN - Zone 6b) on Jan 15, 2012 4:43 PM concerning plant:
    Pink Swamp Milkweed looks a lot like Butterfly Weed except that the mid-summer flowers are rosy-pink and plants have a succulent texture. Growing about 3 feet tall, this perennial needs full sun and can take, but does not require, boggy conditions. It is a butterfly magnet.
  • Posted by ILPARW (southeast Pennsylvania - Zone 6b) on Mar 4, 2018 6:31 PM concerning plant:
    This is a nice, easy, reliable perennial that I have seen wild in many wet meadows and marshes around southeast Pennsylvania and as a garden plant that is sold by conventional and native plant nurseries. It does well in sunny sites with average, mesic soil, even though in nature it is pushed by completion into wet areas. It does self sow some, but not horribly so. It is bothered most years later in summer by the introduced insect pest of the orange Oleander Aphid that does not kill it but makes it suffer and not look as good. This is a fantastic pollinator plant, especially for butterflies.
  • Posted by jmorth (central Illinois) on Nov 6, 2011 11:51 AM concerning plant:
    Habitat preferred - low, wet areas in prairies, borders of marshes, ponds, and ditches. Monarchs really love them.
    Interesting seeds and seedpods.
Plant Events from our members
SCButtercup On June 4, 2014 Bloomed
flaflwrgrl On March 27, 2015 Seeds sown
Direct sown.
Catmint20906 On July 27, 2015 Bloomed
lovesblooms On April 1, 2015 Obtained plant
planted 2x
christine2 On April 14, 2017 Obtained plant
dave On March 16, 2017 Seeds sown
dave On January 29, 2017 Maintenance performed
Placed in moist paper towel in a ziplock bag and placed in the fridge.
bzrhart On May 7, 2017 Obtained plant
MunchkinsMom On October 17, 2016 Obtained plant
Dogwood eBay 2 1/2" pot Dormant $1.75 About 3" tall
Anndixon On May 15, 2018 Obtained plant
jhugart On May 22, 2020 Obtained plant
Acquired second plant at Mother Earth Gardens in northeast Minneapolis.
jhugart On May 22, 2020 Transplanted
Put second Swamp Milkweed plant in the ground, Southern Exposure section, near the first.
jhugart On May 13, 2020 Plant emerged
Noticed new growth at the base of the plant today. Shoots with leaves emerging from the taproot.
dnrevel On February 4, 2022 Seeds sown
Winter sown in red Solo cups.
gochna On November 18, 2021 Seeds sown
sown seeds above the lavenders in-between the stones
paleohunter On June 20, 2022 Seeds sown
» Post your own event for this plant

Discussion Threads about this plant
Thread Title Last Reply Replies
Asclepias incarnata by virginiarose Nov 4, 2013 11:25 AM 1
Information missing from your web site by Nymphaea Jan 26, 2016 4:01 PM 1

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