Platycodon grandiflorus (Balloon Flower, Japanese Bellflower)


Botanical Information

FamilyCampanulaceae
GenusPlatycodon
Speciesgrandiflorus
SynonymsCampanula glauca
CategoryPerennials
OriginEastern Asia. The flower shape is, to borrow from the Greek origin of the name Platycodon, "broad bell" shaped. The ballon reference, on the other hand, relates to the way the flowers puff up just before opening.
Ethnobotanical Uses
Disclaimer
Though the roots and lower leaves are toxic, this plant is used in traditional Chinese medicine, and the roots, once properly processed, are used as an anti-inflammatory cough remedy. In Korea, the cooked roots are used as a salad ingredient.

Details

USDA Hardiness Zone3 - 8
USDA Hardiness Ref.
Canadian Hardiness Zone1a - 7a
Canada Hardiness Ref.
RHS Hardiness ZoneH5 - H7
RHS Hardiness Ref.
Temperature (°C)-40 - (-9)
Temperature (°F)-40 - 15
Height30 - 70 cm
Spread30 - 45 cm
GrowthMedium
Flowering PeriodJune, July, August

Description and Growing Information

LandscapeRock gardens, edging, containers.
PropagationGrowing from seed is the best method of propagation.
CultivationThis low maintenance herbaceous perennial requires medium water and between full sun to partial shade.
PestsSlugs and snails are the main risk to Platycodon grandiflorus, though root rot is possible in soil that is too moist.
Notable SpecimensThe Devonian Botanic Garden, Devon, Alberta, Canada.

Photographs