Campanula poscharskyana 'Blue Waterfall' (Trailing Bellflower) is an undemanding perennial that shines as a groundcover, in rock gardens, path edges, containers, and hanging baskets. Campanula poscharskyana, or trailing bellflower, is native to the Dinaric Alps, a mountainous region in Southern and Southcentral Europe, where it can be found growing in very rocky soils. Plant in well-draining soil. It is drought tolerant once established. To tidy up ‘Blue Waterfall’ you may shear occasionally, otherwise, it is maintenance-free.