Outsidepride Canterbury Bells Campanula Medium White Flower Seed - 5000 Seeds Campanula Medium or Canterbury Bells White grows as a biennial in USDA Zones: 3 - 9 and thrives in full sun to light shade. Campanula has long stems and reaches up to 32 inches in height with white bell-shaped blooms from late spring to early summer. These tall flowers are the perfect addition to any garden and make wonderful cut flowers with a long lasting vase life. Sow these heirloom seeds at 3 - 4 seeds per plant in well-drained soil and keep moist until germination occurs in 14 - 21 days. Our seeds are always Non-GMO and packaged for the current year.