Symphyotrichum laeve. Smooth Blue Aster prefers dry to mesic soils, with full sun to partial shade. This plant will grow medium height and have a blue-purple fall bloom. Smooth Blue Aster pairs well with Little Bluestem, Butterfly Weed, and Wild Bergamot.
More info: https://www.minnesotawildflowers.info/flower/smooth-blue-aster