Campanula glomerata [Genti White] ('Allgentiw') (Genti Series)

RHS Plant Profile

clustered bellflower [Genti White]

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Synonyms

Campanula glomerata 'Allgentiw'

Herbaceous Perennial

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A robust, herbaceous perennial that forms large clumps of upright stems with dark green ovate leaves. Tightly-packed terminal racemes of small, pure white bell-shaped flowers provide a long flowering display in summer

Position

Full sun, Partial shade

Soil Types

Chalk, Sand

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

Moisture: Moist but well–drained
pH: Alkaline or Neutral

Position

Full sun Partial shade

Aspect: East–facing or North–facing or South–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: No
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: Trade

How to Grow

Cultivation

Will grow well in fertile, neutral to alkaline soil that is moist but well-drained, in full sun or partial shade avoiding wet conditions in winter. A semi-shade position will ensure the best flower colour is preserved.

Propagation

Propagate by seed, division or by basal cuttings in spring

Suggested planting locations and garden types

Cottage and informal garden
City and courtyard gardens
Patio and container plants
Wildlife gardens
Flower borders and beds
Garden edging

Pruning

Cut back after flowering to promote extended flowering

Pests

May be susceptible to slugs and snails

Diseases

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