Of the 200 species in the genus, the best known are North American wildflowers. They have small, curiously shaped blooms that appear in dense clusters and are irresistible to butterflies. We offer a brilliantly colored mix of A. tuberosa, Butterfly Weed. Plants bloom in shades of fiery red, orange, and yellow in June and July and make a fine addition to the hot-colored border; also magical with Delphiniums . They need well-drained soil and full sun.