Swamp Milkweed has upright stems, narrow lance-shaped leaves, and rounded clusters of fragrant pink to rose-coloured flowers. After flowering, it produces distinctive pointed seed pods filled with silky seeds that are dispersed by wind. It is an excellent choice for a wet meadow, pond edge or sunny native border. It forms upright clumps and is generally well behaved compared with some other milkweeds. It needs reliable moisture when young but can tolerate somewhat drier conditions once established. Full sun produces the strongest flowering and sturdier growth. Avoid planting it in a permanently dry location.