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Platycodon grandiflorus AGM

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© RHS 1989

Characteristics

Plant type

Herbaceous Perennial

Habit

Clump-forming

Resilience

Hardiness

H5 (hardy - cold winter)

Colour

Flower

Blue in Autumn and Summer

Foliage

Blue and Green in Autumn, Spring and Summer

Size

Ultimate height

0.1-0.5 metres

Ultimate spread

0.1-0.5 metres

Time to ultimate height

2-5 years


Preferred common name

balloon flower

Family

Campanulaceae


Platycodon are herbaceous perennials with neat, ovate leaves and terminal clusters of open bell-shaped flowers which open from large, balloon-shaped buds in late summer

P. grandiflorus is a compact herbaceous perennial to 60cm in height, with blue-green, lance-shaped leaves and large, balloon-like buds opening to wide cup-shaped violet-blue flowers 5cm across

Other common names

  • Chinese balloon flower
  • Chinese bellflower
  • Japanese bellflower

Synonym(s)

  • Campanula grandiflora
  • Platycodon grandiflorus blue
  • Platycodon leweri

How to grow

Sunlight

  • Full sun
  • Part shade

Aspect

  • South-facing, East-facing or West-facing
  • Exposed or Sheltered

Cultivation

Grow in deep, light, fertile, loamy, reliably moist but well-drained soil in full sun or partial shade. May need support; resents disturbance

Soil

  • Moist but well-drained
  • Acid, Alkaline or Neutral
  • Loam

Propagation

Propagate by seed in pots or in situ in spring

Suggested planting locations and garden types

Cottage/Informal Garden, Flower borders and beds, Cut Flowers, Gravel Garden or Rock Garden


How to care

Pruning

Cut back to the base in autumn

Pests

May be attacked by slugs and snails

Diseases

Generally disease free