Symphyotrichum laeve 'Bluebird' (Smooth Aster)
This Mt Cuba Center introduction makes an outstanding garden plant. Strong, upright growth to about 3' tall, the dark green foliage is covered with blue/lavender flowers in late summer and fall. Foliage remains good looking all summer and doesn't get hammered by disease as happens to so many asters out there. Great pollinator plant for the end of the season.