Harebells are a common wildflower in Wyoming; they tolerate a wide variety of conditions and bloom until frost. Rotundifolia means round-leaved, so you may be surprised by all the narrow (i.e., linear) leaves. It’s the first leaves of the seedling that are roundish—really more heart-shaped. Plants are long-lived and spread by seed quite readily, which makes them either care-free or invasive depending on one’s perspective. Ask a friend for some!
Water needs: low
Exposure: full sun
Availability in nurseries: fairly common
Native range: most of North America except the southeastern U.S. (WY native)
Plant family: Campanulaceae