Asclepias incarnata – Swamp Milkweed

General Information: A tall, clump-forming, native perennial. In July and August, the clusters of showy, deep pink flowers form at the crown of this Milkweed species. Like other Asclepias species, the plant is notable for attracting pollinators, especially butterflies. Second only to Common Milkweed (Asclepias syriaca), Swamp Milkweed is a preferred larval host plant for the Monarch Butterfly. Naturally occurs in wet areas, but does well in ordinary garden conditions provided there is no competition. Unlike the sometimes aggressive Common Milkweed, Swamp Milkweed is a short-lived, slow vegetative spreader, even slower to spread by seed. Plants typically live for 5 to 20 years. These plants do not tolerate being dug up and relocated. They will often not survive if this is attempted.

Cultivation Details: In addition to ecological benefits, Swamp Milkweed makes for a fantastic ornamental, especially in areas that tend to pool or lightly flood. An especially attractive choice for planting in areas where a downspout receives full sun. The flowers are extremely fragrant and last quite a while, making them an excellent choice for floral arrangements. The dried seed pods also have an aesthetic appeal and can be used in dry arrangements. Twine and cordage can be obtained from the plant’s stems. This plant is only recommended as a human food source for the trained and experienced forager. Milkweeds are considered edible, but the window during which they can be eaten safely is short. After a period of growth, they acquire high levels of latex, making them unpalatable and likely toxic. Many members of the Dogbane Family (Apocyonaceae) to which Milkweeds belong are important sources of building materials and medicine amongst Indigenous Peoples of North America.

Growing Requirements: Plant in full to part sun. Prefers moist to wet soil. Tolerates average garden soils if sufficiently mulched. Tolerant of most soil types. Does not tolerate competition. Suitable for mildly acidic, neutral, and mildly alkaline soils. Plants grow taller and fuller in mildly acidic soils.