Name: Jeanie Minnesota (Zone 4a) Replace your lawn with a garden!
Jennifer, this is tricyrtis latifolia and it blooms in June rather than in the fall. In my garden it seems to be very easy care. I originally purchased it at a local master gardeners plant sale; I don't often see it at any stores, at least not locally:
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Old gardeners never die. They are just pruned and repotted.