PURPLE PRAIRIE CLOVER. American native wildflower. Easy to grow. Butterflies and bees love this flower. This plant is from the Legume family, so it fixes nitrogen into the soil. Deep tap root makes it very heat and drought tolerant. Full sun or partial shade. Blooms non-stop July, August into early Sept. Thank You. Dalea purpurea. U.S. Native Wildflower. Perennial. Full sun / P. shade. Spring, soil temp 65F+. SOW 1/16" deep, 4" apart. Keep moist. Germination 14-30 days. Thin to 12". Height 24"- 30" x 12" Wide. Medium water, light fertilizer if needed. Flowers are purple. Blooms from early summer through mid-summer.