This perennial grows to a height of 3-5 feet in full sun and moist soil conditions. It has tiny fragrant flowers in spherical umbels and attracts butterflies in July and August. While the usual color is pink, 'Ice Ballet' was selected for its glistening white flowers. The leaves are narrow, lanceolate, and smaller than those of the common milkweed. The narrow seedpods usually grow in pairs. When the pods split open, the wind sends the silky tufted seeds airborne. It can be used as a specimen in a border or butterfly garden and is resistant to deer. Swamp milkweed is a native plant found growing through much of eastern and central North America. Like other milkweeds, it contains a toxic, milky sap and attracts all sorts of insects.