The Douglas Aster (symphyotrichum subspicatum) is a common wildflower with much-branched stems and bright purple aster-like flower heads. They are also great pollinator devices, since pollinators such as bees see brighter colours much more vividly.
Exposure: full sun or part sun
Hardiness Zone: four to eight
Bloom Time: summer
Flower Color: sky blue to white
Height: up to eighty centimeters