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Campanula glomerata 'Superba' AGM

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© RHS 2002

Characteristics

Plant type

Herbaceous Perennial

Habit

Suckering

Resilience

Hardiness

H7 (very hardy)

Colour

Flower

Dark Purple in Summer

Foliage

Green in Autumn, Spring and Summer

Size

Ultimate height

0.1-0.5 metres

Ultimate spread

0.5-1 metres

Time to ultimate height

2-5 years


Preferred common name

clustered bellflower 'Superba'

Family

Campanulaceae


Campanula may be annuals, herbaceous or evergreen perennials, with bell or star-shaped, often blue, flowers in late spring or summer

'Superba' is a strong-growing rhizomatous perennial forming a wide colony of erect stems to 60cm, with oblong to ovate leaves and dense clusters of deep violet-purple, bell-shaped flowers 3cm in length

How to grow

Sunlight

  • Full sun
  • Part shade

Aspect

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

Cultivation

Best grown in fertile, neutral to alkaline soil that is moist but well-drained, in partial shade or sun. No need to stake

Soil

  • Moist but well-drained
  • Alkaline or Neutral
  • Loam or Chalk

Propagation

Propagate by division in spring or autumn or take basal cuttings in winter

Suggested planting locations and garden types

Cottage/Informal Garden, Flower borders and beds, Wildflower meadow, Underplanting of Roses and Shrubs or Cut Flowers


How to care

Pruning

Cut back after flowering to encourage a second flush of flowers

Pests

Damaged by slugs, snails and aphids

Diseases

May be infected by a rust, powdery mildews and a leaf spot