This is Campanula cochleariifolia Bavarian Blue, also known as Baby Blue, Earleaf Bellflower, and Fairies Thimbles. This is one of the most dainty and charming flowers that I have ever seen and the bees are crazy about it. This particular plant has one of the best blues and stays in bloom from the middle of the Summer until early Fall. Growing to only a few inches high this plant likes to live in sun to partial shade. The leaves and flowers can both be eaten raw or cooked. The flavor of both are pleasantly mild and the flowers have a nice sweet flavor. USDA Hardiness Zones 5 to 9