Campanula isophylla 'Alba'

RHS Plant Profile
Italian bellflower 'Alba'

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Synonyms

Campanula isophylla f. alba

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Alpine Rockery
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A rather tender perennial to 20cm tall, with trailing stems bearing heart-shaped leaves and star-shaped pure white flowers 3.5cm across in summer

Position

Full sun, Partial shade

Soil Types

Loam

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

Loam
Moisture
Well–drained
pH
Acid or Alkaline or Neutral

Position

Full sun Partial shade
Aspect
West–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)
H2

Colour & Scent

Season Stem Flower Foliage Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family
Campanulaceae
Native to GB/Ireland
No
Foliage
Deciduous
Habit
Trailing
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

Grow under glass in peat-free, loam-based potting compost in bright filtered light with good ventilation. In growth water moderately and apply a balanced liquid fertiliser monthly; keep just moist in winter

Propagation

Propagate by softwood cuttings in early spring and root with bottom heat

Suggested planting locations and garden types

  • Cottage and informal garden
  • City and courtyard gardens
  • Patio and container plants
  • Coastal
  • Mediterranean climate plants
  • Sub-tropical
  • Conservatory and greenhouse

Pruning

Cut dead stems to the base before winter

Pests

Vulnerable to glasshouse red spider mite, aphids and vine weevil under glass,

Diseases

Powdery mildew may be a problem