How to Propagate clustered bellflower?
Propagate by seed, propagate by division in spring or autumn or by basal softwood cuttings in spring

clustered bellflower · Campanula glomerata
Grow in fertile neutral to alkaline, moist but well-drained soil in sun or part shade. Delicate flower colours are best preserved in shade. Suitable for naturalizing in woodland and wildflower gardens
Propagate by seed, propagate by division in spring or autumn or by basal softwood cuttings in spring