Campanula Glomerata is an extremely long-lived perennial. Superba is a compact, clump-forming plant that features lance-shaped, medium-green foliage and produces clusters of stunning, 1 inch in diameter, deep-purple, violet flowers with a glistening almost metallic sheen. Campanula Superba blooms throughout the season, but the bellflower flowers appear most in early summer attracting hummingbirds, bees and butterflies. Reaching 20 inches in height, Superba has intensely colored, violet flowers and stiff stems that make it a delightful cut flower.