How to prune campanula glomerata 'superba'

After first flowering (early to mid summer), then again in early spring. After the first flowering flush, cut stems back by roughly half to encourage new basal growth and a second flush. In early spring, cut all remaining old stems to near ground level before new growth pushes up. Divide congested clumps every 2–3 years to maintain vigour.

Twice yearly: mid-summer deadhead/cut-back, then early spring tidy. Campanula glomerata 'Superba' benefits from cutting back after the first flush to encourage repeat flowering. Once the main flush of clustered violet flowers fades in early summer, cut stems back by about half. A tidy autumn or early spring cut-back removes old growth and keeps the clump vigorous.

After the first flowering flush, cut stems back by roughly half to encourage new basal growth and a second flush. In early spring, cut all remaining old stems to near ground level before new growth pushes up. Divide congested clumps every 2–3 years to maintain vigour.