Heart Leaved Aster
Symphyotrichum cordifolium
Notes:

From what I've read, Asters are one of the best caterpillar host plants. The adult pollinators also like them.

Two - four foot flower with clusters of lavender blossoms. Very pretty in fall after summer flowers are done. Excellent for bees.

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Photos:
I think the environment should be put in the category of our national security. Defense of our resources is just as important as defense abroad. Otherwise what is there to defend?
Robert Redford
Yosemite National Park dedication, 1985