Campanula portenschlagiana 'Resholdt's Variety' Dark blue bells for much of the summer. £2.60 Out of stock. Deep violet-blue bells give a lovely display over a long period. Flowers on short stems arising from a central clump of greenery. About 12cm high. An ideal rockery plant - easy to grow in most soils and flowers for much of the summer. Also very useful for planting in a stone wall where it will creep gently between the stones and cascade down.