Campanula affinis

RHS Plant Profile
Bolos harebell

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Synonyms

Campanula bolosii

Herbaceous Perennial

A compact, upright herbaceous perennial flowering in summer, in shades of blues and white

Position

Full sun, Partial shade

Soil Types

Chalk, Loam, Sand

Max Height

0.5-1 metres

Max Spread

0.1-0.5 metres

Size

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

Growing Conditions

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

Position

Full sun Partial shade
Aspect
West–facing or South–facing or East–facing
Exposure
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
Evergreen
Habit
Columnar upright
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
Spain

How to Grow

Cultivation

Best grown in fertile, neutral to alkaline, moist but well drained soils in sun or partial shade. Cut back after flowering to prevent self-seeding and encourage a second flush of flowers

Propagation

Propagate by division in spring or autumn

Suggested planting locations and garden types

  • Cottage and informal garden
  • Flower borders and beds
  • Underplanting of roses and shrubs

Pruning

Cut dead stems to the base before winter

Pests

May be susceptible to slugs and snails

Diseases

May be susceptible to powdery mildews