Bellflowers number around 300 species, found across the northern hemisphere, ranging from smaller alpine-like ground cover, C.poscharskyana to stately border perennials, C.latifolia var. macrantha 'Alba'. There won't  be many gardens without a Campanula of some sort, being a staple of a cottage garden style, a typical border, with some forms happy in shade. Bell-shaped flowers, ranging from white through to lilac-purple, are on show generally during late spring into summer. The Chelsea chop can help reduce the need for staking for taller varieties and cut down after flowering to encourage a second flush of flowers.