After bloom cut the foliage back to the basal leaves. The plant will respond with a new flush of foliage. Can be aggressive in good sites. Divide to maintain vigor.
Propagation
seeds, easy from division in the spring
Native Site
Species native to Europe.
Notes & Reference
#04-Herbaceous Perennial Plants (Allan Armitage), #209-Campanulas A Gardeners Guide (Peter Lewis and Margaret Lynch)