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. Needs afternoon shade and moderate watering. Cannot tolerate foot traffic. 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.