Campanula rotundifolia 'Thumbell Blue'

RHS Plant Profile
harebell 'Thumbell Blue'

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harebell 'Thumbell Blue' visionspictures.com
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Herbaceous Perennial

A low-growing perennial, to around 30cm high, with a spreading habit and small, rounded to broadly oval green leaves. Produces small, nodding, bell-shaped, soft violet-blue flowers on slender, wiry stems from early to late summer

Position

Full sun, Partial shade

Soil Types

Chalk, Loam, Sand

Max Height

0.1-0.5 metres

Max Spread

0.1-0.5 metres

Size

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

Growing Conditions

Chalk Loam Sand
Moisture
Well–drained
pH
Alkaline or Neutral

Position

Full sun Partial shade
Aspect
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
Accepted

How to Grow

Cultivation

Thrives in well-drained soil in sun or light, part-day shade. Protect from excess winter wet

Propagation

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

Suggested planting locations and garden types

  • Cottage and informal garden
  • Patio and container plants
  • Rock garden
  • Wildflower meadow
  • Wildlife gardens

Pruning

Cut back after flowering to maintain compact shape

Pests

May be susceptible to aphids, slugs and snails

Diseases

May be susceptible to powdery mildews and rust diseases