Serbian bellflower Campanula 'Silberregen' White - Bio - Hardy plantBell shaped, white flowers. The lushly blooming bellflower 'Silberregen' (Campanula poscharskyana) is a real eye catcher. The organically grown plant has small, white flowers. The plant is low growing and fantastic as ground cover, or in a beautiful pot on the balcony. Place the plant in full sun or partial shade. and make sure that the soil remains slightly damp. The plant is organically grown! In other words, no chemical pesticides or fertilizers