Campanula glomerata

RHS Plant Profile
clustered bellflower

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clustered bellflower RHS

Other common names

clychlys clwstwr

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Herbaceous Perennial
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Vigorous rhizomatous perennial to about 45cm tall, forming an extensive clump of erect stems bearing dark green ovate leaves, and dense terminal racemes of deep violet-blue, or white, bell-shaped flowers all summer

Position

Full sun, Partial shade

Soil Types

Chalk, Sand, Loam

Max Height

0.1-0.5 metres

Max Spread

0.5-1 metres

Size

Time to Maturity
2–5 years
Max Spread
0.5-1 metres
Max Height
0.1-0.5 metres

Growing Conditions

Chalk Sand Loam
Moisture
Moist but well–drained
pH
Alkaline or Neutral

Position

Full sun Partial shade
Aspect
South–facing or North–facing or East–facing or West–facing
Exposure
Exposed or Sheltered
Hardiness

Hardiness Ratings

All ratings refer to the UK growing conditions unless otherwise stated. Minimum temperature ranges (in degrees C) are shown in brackets

  • H1A: under glass all year (>15C)
  • H1B: can be grown outside in the summer (10 - 15)
  • H1C: can be grown outside in the summer (5 - 10)
  • H2: tolerant of low temperatures, but not surviving being frozen (1 to 5)
  • H3: hardy in coastal and relatively mild parts of the UK (-5 to 1)
  • H4: hardy through most of the UK (-10 to -5)
  • H5: hardy in most places throughout the UK even in severe winters (-15 to -10)
  • H6: hardy in all of UK and northern Europe (-20 to -15)
  • H7: hardy in the severest European continental climates (< -20)
H7

Colour & Scent

Season Stem Flower Foliage Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family
Campanulaceae
Native to GB/Ireland
Yes
Foliage
Deciduous
Habit
Clump forming
Genus
Campanula may be annuals, herbaceous or evergreen perennials, with bell or star-shaped, often blue, flowers in late spring or summer
Name Status
Correct
Plant Range
Europe, temp. Asia

How to Grow

Cultivation

Grow in fertile neutral to alkaline, moist but well-drained soil in sun or part shade. Delicate flower colours are best preserved in shade. Suitable for naturalizing in woodland and wildflower gardens

Propagation

Propagate by seed, propagate by division in spring or autumn or by basal softwood cuttings in spring

Suggested planting locations and garden types

  • Cottage and informal garden
  • Wildflower meadow
  • Wildlife gardens
  • Flower borders and beds
  • Ground cover

Pruning

Cut back after flowering to prevent self-seeding and to encourage a second flush of flowers

Pests

May be susceptible to slugs and snails

Diseases

May be susceptible to a rust, powdery mildews and a leaf spot