8” tall x 10-12” wide. Campanula rotundifolia 'Thumbell™ Blue' (Bellflower) is a tidy, long-blooming perennial that thrives in partial shade. 'Thumbell™ Blue' blooms for many months with a profuse display of nodding blue flowers held on wiry stems. Campanula rotundifolia 'Thumbell™ Blue' is an improved selection of this Northern Hemisphere wildflower that blooms more heavily and has a more uniform growth habit. This is a ideal perennial for spots with morning sun. It thrives in full sun at higher elevation, mountain locations.