Campanula poscharskyana (Serbian Bell Flower) - Half trailing, prostrate growth, able to cling to dry walls. Large rock gardens or sandy banks permit the 2' stems to trail. Requires regular water and does best in filtered sunlight or morning sun. Starry blue flowers highlight your garden in summer. Remove about 1/3 of plant after blooming to freshen foliage. Can divide every 3-4 years in the spring or fall.