Short-lived perennial, sometimes treated as biennial, of the Campanulaceae family. Endemic to central Greece and Attica, it colonizes limestone cliffs, rocky scree, and rock crevices in Mediterranean and sub-Mediterranean environments, generally at low and medium altitudes.
It forms spreading, semi-bushy clumps, 20 to 40 cm in height, with branched stems bearing oval to heart-shaped, bright green foliage, slightly crenate and fresh-looking despite the southern origin of the plant. The stems, sometimes reddish, spread freely among the stones, naturally fitting into the crevices of the rocks.
The flowers are the most remarkable feature of the species: very large bells widely open and curved outward at their end, from pale lilac-blue to delicate lavender-blue, with the lobes slightly curved outward, giving them a broad and airy appearance unusual in the genus. They are borne in generous numbers on well-branched stems.
In its natural habitat, its flowering extends from June to August. In cultivation, it generally blooms from May to July.
It requires perfect drainage, a poor to moderately rich soil, preferably limestone, in a well-sunny exposure. It readily reseeds itself and thus naturally renews in rock gardens and walls.