Perennial of the Campanulaceae family, widely spread in the mountains of Europe, from the Pyrenees to the Carpathians through the Alps and the northern Apennines, where it colonizes screes, rock crevices, moraines, and old walls, between approximately 800 and 2,800 meters. It favors calcareous, well-drained, often shallow substrates.
It forms small low and stoloniferous clumps, 5 to 15 cm in height, spreading laterally through a fine network of superficial rhizomes that allows it to gradually cover large areas between stones. The basal leaves are round to kidney-shaped, long-petioled and slightly toothed; the cauline leaves are narrower and sessile.
The flowers, hanging and solitary at the top of slender stems, are in a narrow and elongated bell shape, with a delicate lilac-blue to blue-violet color, sometimes white in certain horticultural forms. Their slightly inclined posture gives them a quite charming airy and graceful character.
In its natural habitat, its flowering extends from July to September depending on the altitude. In cultivation, it generally blooms from June to August.
It thrives in poor, calcareous, and very well-drained soil, in full sun. Ideal for rock gardens, walls, and alpine troughs.