Whorled Milkweed is a tough, attractive herbaceous perennial easily grown in dry, sunny locations in naturalistic as well as garden settings. It is on the small side, reaching 2.5 feet high and wide, with bright white flowers and delicate, whorled foliage. Like all Milkweeds, it is toxic to livestock, so it is not found in cultivated pastures. But this is a pioneer species and one of the few clone-forming milkweeds — it vigorously colonizes disturbed roadsides, ditches and railroad rights of way by means of its rhizomatous habit as well as by wind distribution of the silken-tasseled seeds. In open, sunny areas with exposed soil, this plant can spread aggressively. It is very widely distributed, all the way from the great plains eastward (in NC, mostly in the Piedmont). Since it is among the last milkweeds to go dormant, it is an important late-season food source for Monarch butterflies and their caterpillars. There is little reason not to have this wildflower, considering its value to Monarchs and other butterflies, its adaptability and ease of cultivation and visual attractiveness.