Hall's Aster (Symphyotrichum hallii) is a summer blooming native perennial.
 
From mid to late summer, this 3-4 ft tall plant is covered with 1" flowers ranging from white to very pale lavender.
 
Hall's Aster is a major pollinator resource, providing pollen and nectar for all sorts of bees and butterflies from summer into fall. Full sun, and drought tolerant.