Bellflowers are among the most popular of perennials. This showy, dwarf species is often grown in rock gardens, used as an edging or for tubs and pots. Plants form a spreading patch of small green leaves, bearing loads of starry lavender-blue flowers in late spring. Because this is vigorous, keep it away from delicate alpine plants that could be accidentally smothered. Also may be used as a groundcover for a smaller area, especially nice under shrub roses. Clip back hard after blooming (to 2 inches) to maintain a tidy, compact appearance.