How to Prune milky bellflower 'Superba'?
Cut back after flowering to promote extended blooms

milky bellflower 'Superba' · Campanula lactiflora 'Superba'
Will grow well in fertile, neutral to alkaline soil that is moist but well-drained, in full sun or partial shade avoiding wet conditions in winter. A semi-shade position will ensure the best flower colour is preserved. Will need staking in exposed sites. For more information see staking perennials.
Cut back after flowering to promote extended blooms