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Dig into Plants: Swamp Milkweed

Swamp Milkweed

Other Common Names: Pink Milkweed

Scientific Name: Asclepias incarnata

Native to Alabama: Yes

Other common milkweed species: Butterfly Milkweed, Common Milkweed, Whorled Milkweed

Milkweed

Wikimedia – peganum
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Learn more about…

Basic Information
Classification Button
Maintenance
Adaptations Button
Plant ID
Life Cycle

Basic Plant Information

  • I am a vascular plant with no woody stems above ground, so I am herbaceous.
  • I do not keep leaves year-round, so I am deciduous.
  • I die back in winter but regrow in spring for many seasons, so I am perennial.
  • I can grow 3 – 5 feet high and 2 – 3 feet wide.
Lady Bird Johnson Wildflower Center – Peggy Romfh
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Ecological Benefits
This plant provides food for:
Butterflies Caterpillars Native Bees Hummingbirds
Monarch, Queen
Other Plants Found in Alabama with Similar Ecological Benefits:
Butterfly Milkweed
(Asclepias tuberosa)
White Milkweed
(Asclepias variegata)
Green Milkweed
(Asclepias viridis)
Pinewoods Milkweed
(Asclepias humistrata)
Common Milkweed
(Asclepias syriaca)
Eastern Whorled Milkweed
(Asclepias verticillata)
Swamp Forest Milkweed/
Aquatic Milkweed
(Asclepias perennis)
Tropical/Scarlet Milkweed
(Asclepias curassavica)


Maintenance Notes
  • Dormant in winter.
  • Plant can spread aggressively.
  • Flowers can be cut for an indoor vase.
  • Plant will likely get aphids which can be left on the plant for ladybugs to eat. If aphids become a problem, refer to our Tips to Control Aphids on Milkweed document.
  • Collect seeds in late fall for propagation.
  • When watering, hold hose to base of plant for a count of 5 seconds. Water should reach all roots.
  • Avoid sprinkling water on the leaves.
  • Requires average amount of water.
Average watering: water two times per week during the summer and once per week during the rest of the year.

Habitat Requirements
This plant prefers:

Full Sun
(6+ hours of sun per day)

Part Sun/Shade
(2 – 6 hours of sun per day)


Average Watering
Loamy, Clay, Acidic, or Moist Soil

Leaf, Flower & Seed Identification
LEAF DESCRIPTION
Minnesota WildflowersKaty Chayka
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Leaf Characteristics Chart (JPG)
Shape:
Lanceolate
Margin:
Entire/Smooth
Arrangement:
Opposite
Form:
Simple
Description:
Long and narrow green, hairless leaves; 2.75-6 inches long and 0.5-1 inch wide; tapering to a point

FLOWER DESCRIPTION

Lady Bird Johnson Wildflower Center
Joseph A. Marcus

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Flower Shapes Chart (JPG)
Color:
Light Pink/Light Purple, Magenta, or Red
Shape:
Stellate
(star-shaped)
Bloom Months:
June – Oct
Description:
Individual flowers are 0.25 inches across with 4-5 petals per flower; form clusters up to 2-3 inches wide; crown of flower has 5 parts with a curved horn sticking out above each part
SEED DESCRIPTION
Lady Bird Johnson Wildflower Center
Julie Makin

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Type:
Fruit –
Dry Seed Pod
Description:
Follicle is 3-4 inches long and splits on one side to release brown seeds, each with silky tufts
Months in Seed:
Fall
Plant spreads by:
Seeds and Rhizomes/ Tubers/ Roots & Shoots
Silky-haired seeds are dispersed by wind; underground rhizomes spread and create new clumps of plants

Plant Life Cycle
Plant Life Cycle:

  • All plants start life as a seed.
  • The seed turns into a sprout when it grows roots.
  • The sprout becomes a seedling as grows a stem and leaves above the ground.
  • After the seedling becomes an adult plant it will grow flowers.
  • After the flowers finish blooming, each flower turns into a seed.
  • When the seeds fall down to the ground, the plant life cycle starts again.
  • Each seed can become a plant if it has the food, water and space that it needs to grow.
General Plant Life Cycle
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ADDITIONAL RESOURCES FOR TEACHERS

Quick Fact Sheet
(Condensed Species Info)
QR Code
(Links to this Webpage)
Plant ID Sign (Text Only):
Ready as-is PDF
Plant ID Sign (Text Only):
Editable Word Doc
Plant ID Sign (With Picture):
Ready as-is PDF
Plant ID Sign (With Picture):
Editable Word Doc


INFORMATION SOURCES FOR THIS PLANT

Lady Bird Johnson Wildflower Center Logo
USDA Natural Resources Conservation Service Logo
Alabama Plant Atlas Logo
Alabama Butterfly Atlas Logo
Missouri Botanical Gardens Logo 2019
Alabama Plant Atlas Logo