Growing to 60 cm (24 in) tall by 30 cm (12 in) wide, it is an herbaceous perennial with dark green leaves and blue flowers in late summer. A notable feature of the plant is the flower bud, which swells like a balloon before fully opening.
The five petals are fused together into a bell shape at the base, like its relatives, the campanulas.
The five petals are fused together into a bell shape at the base, like its relatives, the campanulas.