Campanula

Campanula glomerata 'Superba' is a strong-growing rhizomatous perennial forming a wide colony of erect stems to 60cm, with oblong to ovate leaves and dense clusters of deep violet-purple, bell-shaped flowers 3cm in length.  Photo credit to the Hardy Plant Society UK..

80cm A double white form of the peach-leaved bellflower of early summer, which forms rosettes.  Can be a floppy plant but it holds its wirey stems well if planted amongst other plants.  

Telham Beauty has larger flowers than the species. Porcelain-blue. Stems erect holding the flowers above the foliage. Good for specimen planting in full sun or semi-shade. Summer flowering