Deep green, lance-like leaves line upright stems that end with flattened masses of lightly fragrant white flowers in early to mid summer. It is perfect for grouping in the back of the garden and thrives in moist to wet areas. This is an essential nectar source for native butterflies and insects.
Swamp milkweed, true to its name, prefers consistently moist soil, but performs admirably in average, well-drained gardens as well. Full sun is best and some shade is tolerated, though blooming time and color may suffer.