Cylindrical heads of unusual bright purple flowers. Plants require well-drained site. This prairie legume fixes nitrogen in garden soil. Grows 2-3′ tall in full sun. Honeybees, native bees, wasps, butterflies, skippers, moths and beetles seek nectar and pollen from the flowers. Plants host caterpillars of Dogface sulfur butterflies.
NATIVE TO THE CENTRAL US AND EAST.