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Asclepias incarnata (Swamp milkweed) | NPIN
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Asclepias incarnata (Swamp milkweed)
Marcus, Joseph A.

Asclepias incarnata

Asclepias incarnata L.

Swamp milkweed, Pink Milkweed

Asclepiadaceae (Milkweed Family)

Synonym(s):

USDA Symbol: asin

USDA Native Status: L48 (N), CAN (N)

The large, bright, terminal blossoms of this showy, 2-4 ft. perennial are made up of small, rose-purple flowers. Deep pink flowers clustered at the top of a tall, branching stem, bearing numerous narrow, lanceolate leaves. Opposite, narrow, lance-shaped leaves line the erect, open-branched stem. Elongated, tan-brown seed pods persist into winter.

The juice of this wetland milkweed is less milky than that of other species. The genus was named in honor of Aesculapius, Greek god of medicine, undoubtedly because some species have long been used to treat a variety of ailments. The Latin species name means flesh-colored.

 

Plant Characteristics

Duration: Perennial
Habit: Herb
Root Type: Fibrous
Leaf Complexity: Simple
Leaf Shape: Lanceolate
Leaf Venation: Pinnate
Leaf Margin: Entire
Leaf Apex: Acute
Leaf Base: Rounded
Breeding System: Flowers Bisexual
Size Notes: Plant 3-6 in height. Follicles 7-9 cm long, 1.2 cm in diameter.
Leaf: Green
Flower: Sepals 5
Fruit: Green, 5 in.
Size Class: 3-6 ft.

Bloom Information

Bloom Color: Pink , Purple
Bloom Time: Jun , Jul , Aug , Sep , Oct

Distribution

USA: AL , AR , CO , CT , DC , DE , FL , GA , IA , ID , IL , IN , KS , KY , LA , MA , MD , ME , MI , MN , MO , MT , NC , ND , NE , NH , NJ , NM , NV , NY , OH , OK , PA , RI , SC , SD , TN , TX , UT , VA , VT , WI , WV , WY
Canada: MB , NB , NS , ON , PE , QC
Native Distribution: Manitoba, Quebec, and Nova Scotia; from New England south to Georgia; west to Louisiana, and Texas; north to North Dakota.
Native Habitat: Wet Meadow, Prairie, Field, Riparian, Swamp, Marsh

Growing Conditions

Water Use: High
Light Requirement: Sun , Part Shade
Soil Moisture: Moist , Wet
CaCO3 Tolerance: Medium
Soil Description: Rich, wet, very muddy to average garden moisture. One of the few ornamentals that thrives in mucky clay soils. Prefers neutral to slightly acidic soil but will tolerate heavy clay.
Conditions Comments: With its showy flower clusters that attract butterflies and hummingbirds, swamp milkweed is underutilized in gardens. In moist soils or in a pond, it will thrive. The interesting seed pods look like other milkweeds. Swamp milkweed will inevitably have aphids. The insects are not a problem unless the plant looks sick; at that point an effective treatment is to spray the plant and aphids with soapy water. Another possible treatment is to support the plant part with your hand and blast it with high-pressure water. Good for wetland gardens and habitat.

Benefit

Use Ornamental: Herbaceous perennial forming stately clump of upright stems with long narrow leaves and heads of fragrant soft mauve pink flowers, composed of many small intricate flowers.
Use Wildlife: Milkweeds are an important food source for the monarch caterpillar.
Use Food: Although milkweeds are poisonous raw, the young shoots, leaves and seed pods are all edible cooked. When placed in cold water, brought to a boil and simmered till tender, milkweeds are said to be delicately flavoured and harmless. (Poisonous Plants of N.C. State) The flower buds, nectar-sweet flowers and seeds are also edible. (Kershaw)
Warning: All parts. Toxic only in large quantities. Syptoms include, vomiting, stupor, weakness, spasms. Toxic Principle: Cardiac glycosides and resinoids.
Conspicuous Flowers: yes
Fragrant Flowers: yes
Attracts: Butterflies , Hummingbirds
Larval Host: Monarch and Queen butterflies.
Nectar Source: yes
Deer Resistant: High

Value to Beneficial Insects

Special Value to Native Bees
Special Value to Bumble Bees
Special Value to Honey Bees
Supports Conservation Biological Control

This information was provided by the Pollinator Program at The Xerces Society for Invertebrate Conservation.

Butterflies and Moths of North America (BAMONA)

Asclepias incarnata is a larval host and/or nectar source for:
Monarch
(Danaus plexippus)

Larval Host
Learn more at BAMONA
Queen
(Danaus gilippus)

Larval Host
Learn more at BAMONA

Propagation

Propagation Material: Seeds
Description: Easy to start from seed. Established plants may be divided in spring.
Seed Collection: Watch plants closely and collect seed in October, November.
Seed Treatment: Heat helps germination.

Find Seed or Plants

Find seed sources for this species at the Native Seed Network.

View propagation protocol from Native Plants Network.

Mr. Smarty Plants says

Native flowers for Door County, Wisconsin
September 02, 2009
We recently were required to put in a new septic system on our vacation property in Door County, WI. This left us with a clearing on our wooded lot where the septic field is now located. The installer...
view the full question and answer

Attracting butterflies in Tennessee
July 03, 2009
What flowers and plants do the caterpillars in Tennessee eat? And do you know what butterflies live in Tipton Co. Tennessee?
view the full question and answer

National Wetland Indicator Status

Region:AGCPAKAWCBEMPGPHIMWNCNEWMVE
Status: OBL OBL OBL FACW OBL OBL OBL
This information is derived from the U.S. Army Corps of Engineers National Wetland Plant List, Version 3.1 (Lichvar, R.W. 2013. The National Wetland Plant List: 2013 wetland ratings. Phytoneuron 2013-49: 1-241). Click here for map of regions.

From the National Suppliers Directory

According to the inventory provided by Associate Suppliers, this plant is available at the following locations:

Edge of the Woods Native Plant Nursery - Orefield, PA
Amandas Garden - Springwater, NY
Sunshine Farm & Gardens - Renick, WV
Enchanter's Garden - Hinton, WV
Ohio Prairie Nursery - Hiram, OH
American Native Nursery - Quakertown, PA
Toadshade Wildflower Farm - Frenchtown, NJ
Prairie Nursery - Westfield, WI

From the National Organizations Directory

According to the species list provided by Affiliate Organizations, this plant is on display at the following locations:

Lady Bird Johnson Wildflower Center - Austin, TX
Native Plant Center at Westchester Community College, The - Valhalla, NY
Delaware Nature Society - Hockessin, DE
Natural Biodiversity - Johnstown, PA
Native Seed Network - Corvallis, OR
Mt. Cuba Center - Hockessin, DE
* Available Online from Wildflower Center Store

Bibliography

Bibref 928 - 100 easy-to-grow native plants for Canadian gardens (2005) Johnson, L.; A. Leyerle
Bibref 1186 - Field Guide to Moths of Eastern North America (2005) Covell, C.V., Jr.
Bibref 1185 - Field Guide to Western Butterflies (Peterson Field Guides) (1999) Opler, P.A. and A.B. Wright
Bibref 1620 - Gardening with Native Plants of the South (Reprint Edition) (2009) Wasowski, S. with A. Wasowski
Bibref 946 - Gardening with Prairie Plants: How to Create Beautiful Native Landscapes (2002) Wasowski, Sally
Bibref 841 - Native Alternatives to Invasive Plants (2006) Burrell, C. C.
* The Midwestern Native Garden: Native Alternatives to Nonnative Flowers and Plants An Illustrated Guide (2011) Adelman, Charlotte and Schwartz, Bernard L.

Search More Titles in Bibliography

Additional resources

USDA: Find Asclepias incarnata in USDA Plants
FNA: Find Asclepias incarnata in the Flora of North America (if available)
Google: Search Google for Asclepias incarnata

Metadata

Record Modified: 2013-09-09
Research By: TWC Staff, RLU

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