Platycodon grandiflorus 'Double Blue'
Common Name: Balloon Flower.
Zones 3 to 8.
Full sun to part shade.
Plants reach 24 inches tall and 12 to 18 inches wide.
Growth rate: Moderate, herbaceous clump-forming perennial.
Blossoms swell into balloon-like buds, before they burst open into vibrant violet-blue, double, bell-shaped flowers. 'Double Blue' is a very reliable bloomer that is pest and disease free. Deadheading generally prolongs the bloom period.