With Campanula pos. 'Blue Waterfall' (Serbian Bellflower 'Blue Waterfall') you can add a soft, cascading spill of violet-blue, star-shaped blooms to walls, rock gardens, and the front of beds. This low, mounding perennial blooms heavily in late spring and often continues with lighter flowering into summer, creating a draping effect as stems trail and weave through nearby plants.
Plant it where you can enjoy its arching, spreading habit: along edges, tucked into crevices, or in containers where it can tumble over the rim. Mature plants typically stand about 12-15 inches tall and spread outward as they knit into a broad, flowing mat. The medium-green foliage stays attractive through the growing season, and in milder winters it can hold some foliage longer.
Give it well-drained soil and steady moisture while it establishes. Afterward, it is generally easy to grow with average watering, especially in garden beds that do not stay soggy. Full sun brings the best flowering in cooler climates, while part shade is helpful where summers run hot.
To keep growth tidy and encourage fresh new foliage, you can shear or lightly trim after the main bloom. If it begins to creep farther than you want, simply edge it back; stems are easy to cut and reshape. Divide clumps in spring if you want to refresh older plantings or share starts with friends.