Butterfly Garden Plant Asclepias incarnata Swamp Milkweed

Butterfly Garden Plants

Swamp Milkweed

(Asclepias incarnata)

General Information
Cultural Requirements
Native Range
Plant Rating
Plant Reviews

General InformationNABA_DividerBar

Swamp Milkweed with Eastern Tiger Swallowtail

Swamp Milkweed with Eastern Tiger Swallowtail

Appreciative of damp locations, Swamp Milkweed plants will increase in size by sending out underground stems, called rhizomes, which produce clumps of plants. The rhizomes do not spread far, resulting in a garden plant that is thick and eye-catching to butterflies as well as other pollinators.

Importance as a butterfly nectar source:

Once established in the garden, Swamp Milkweed plants will produce a large number of showy blooms per plant that are attractive to a variety of butterflies. The large number of blooms per plant make Swamp Milkweed an essential butterfly garden plant.Importance as a caterpillar food source:
Like all milkweeds, Swamp Milkweed is an important food source for Monarch caterpillars.


Cultural RequirementsNABA_DividerBar

USDA Hardiness Zone 3 to 9
Bloom Period July to August
Bloom Color White to light pink
Plant Height 24 inches
Plant Spread Varies
Light Exposure Sun to light shade
Soil Moisture Moist to wet
Animal/Disease Problems Deer resistant, aphids may be a problem


Native RangeNABA_DividerBar
Asclepias incarnata







Plant RatingNABA_DividerBar
Plant rating scale ranges from 0 to 3. Plants rating 3 are the most useful for butterfly gardens. For more details on the ratings, see Native Plant Ratings

Garden Rating 3
Nectar Rating 3
Caterpillar Rating 3


Plant Reviews

From a NABA member Swamp Milkweed is easy to grow from seed