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:
We need to consider how our actions affect wildlife and the environment, and how they are likely to affect others.
Dalai Lama