Liatris aspera. Found in woodlands, savannas, and dry prairies. Great addition to pollinator and prairie gardens and in mixed borders. Attracts bees, birds, and butterflies. Grows in dry to mesic soil conditions in full sunlight to part-shade. Ranges from 1-4′ in height. Purple flowers bloom in Summer to early Fall.
More info: https://www.minnesotawildflowers.info/flower/rough-blazing-star