This species is included as a warning, seed often being erroneously offered under a variety of Campanula and Symphyandra names. It is an erect perennial with some tuberous roots and spreading at great speed by slender, brittle rhizomes. Basal leaves oblong to ovate, cordate, serrated, long-stalked. Stems erect, leafy, 40-90cm or more in height. Flowers pendent, 2-3cm long, bell-shaped, violet-blue, in long racemes. Most of Europe, in waste ground, rocky places and forest margins. Reginald Farrer aptly described this plant as the 'most insatiable and irrepressible of beautiful weeds'. Once established in the garden it is very difficult to exterminate.