Eurybia macrophyllus, also known as Bigleaf Aster or Large-leaved Aster, is native to the United States and Canada.  This native wildflower has large, heart-shaped leaves, erect stems, and is smothered in small lavender, aster-like flowers, each with a yellow eye, in late summer or early fall.  Bigleaf Aster grows from three to four feet in sun to partial shade and average soil.  It is perfectly suited to the woodland garden where it can form a ground cover, but it is also suitable for containers.  I have read that the young leaves of this species may be cooked and eaten as greens, although I have yet to try it and cannot vouch for its tastiness.  Birds and butterflies love this native wildflower.  Quarts.   Zones 3-8.