No rockery is really complete without at least one species of Campanula, and there are many types from which to make your choice. All need well-drained soil and the addition of lime if the ground is acid. Most species will flourish in light shade and the popular varieties are. Slugs are the worst enemy – scatter Slug Pellets around the plants in spring. June and July are the peak flowering months, and Campanulas have a well-earned reputation for bearing masses of blooms. These are of two distinct types, depending on the species. The usual form is a bell, sometimes held erect but more commonly pendent. The other form is a star-like bloom, with C. garganica and C. poscharskyana as examples.
VARIETIES: One of the most popular species is C. carpatica – height 10 in., spread 1 ft.
Flowering period: June-September. It bears large cup-shaped flowers in shades ranging from pure white to deep blue. C. cochlearifolia (Fairy Thimbles) is a much daintier plant – it spreads as wide as C. carpatica and flowers during the same period, but the height of the floweringis only 3 in. and the flowers are small pendent bells in blue or white. If the site is shady, grow C. muralis – height 4 in., spread 1 ft.
Flowering period: June-September. It bears masses of purple bell-shaped flowers which cover the leafy trailing. C. poscharskyana is the one to choose if you want to cover a large area quickly. Its basic details are height 10 in., spread 2 ft and the lavender or white starry flowers appear between June and September. If you want a star-like Campanula which will not spread everywhere, pick instead C. garganica, which produces compact tufts and long trails of blue or white blooms between June and August.
SITE AND SOIL: Any well-drained, non-acid soil -thrives in sun or light shade.
PROPAGATION: Sowunder glass or divide clumps in spring. Alternatively plant non-flowering in a cold frame in late spring.