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AGM plants have been through a rigorous trial and assessment programme. They are:
This plant will provide nectar and pollen for bees and the many other types of pollinating insects.
It is included in an evolving list of plants carefully researched and chosen by RHS experts. Divided into 3 groups these lists, linked below, are maintained by a team of RHS staff and are reviewed annually.
© The Harry Smith Collection
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Other common names broad-leaved bellflower giant bellflower
haskwort large-flowered bellflower throat root throatwort
Family Campanulaceae
Genus Campanula may be annuals, herbaceous or evergreen perennials, with bell or star-shaped, often blue, flowers in late spring or summer
Details C. latifolia is an erect, clump-forming perennial to 1.2m tall, with oval leaves and loose racemes of nodding bell-shaped violet-blue flowers 5cm long in summer
Plant range Europe to Kashmir
Foliage Deciduous
Habit Bushy
Hardiness
All ratings refer to the UK growing conditions unless otherwise stated. Minimum temperature ranges (in degrees C) are shown in brackets
H7
Full Sun
Partial Shade
Aspect South-facing or North-facing or West-facing or East-facing
Exposure Sheltered or Exposed
Sand
Clay
Chalk
Loam
MoistureWell-drained, Moist but well-drained
SoilSand, Clay, Chalk, Loam
pHAcid, Alkaline, Neutral
Ultimate height 1-1.5 metres
Ultimate spread 0.1-0.5 metres
Time to ultimate height 2-5 years
Cultivation Any fertile, moist but well-drained soil in sun or partial shade; the delicate flower colour is best preserved in shade
Propagation Propagate by seed in containers in a cold frame in spring. Divide in spring or early autumn. Take stem-tip cuttings from new growth after flowering
Suggested planting locations and garden types Flower borders and beds Underplanting of Roses and Shrubs Cottage & Informal Garden Wildflower meadow
Pruning Cut back after flowering to prevent self-seeding and to encourage a second flush of flowers
Pests Vulnerable to slugs and snails
Diseases Powdery mildew and rust may be problematic
RHS members can get exclusive individual advice from the RHS Gardening Advice team.
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