• AGM plants

    AGM plants have been through a rigorous trial and assessment programme. They are:

    • Excellent for ordinary use in appropriate conditions
    • Available to buy
    • Of good constitution
    • Essentially stable in form & colour
    • Reasonably resistant to pests & diseases

Campanula tommasiniana

Tommasini bell flower

AGM plants

AGM plants have been through a rigorous trial and assessment programme. They are:

  • Excellent for ordinary use in appropriate conditions
  • Available to buy
  • Of good constitution
  • Essentially stable in form & colour
  • Reasonably resistant to pests & diseases
Tommasini bell flower

© RHS

  • Other common names Tommasini bell flower

  • 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. tommasiniana is a compact perennial forming a clump to 10cm tall, with nodding, narrowly bell-shaped, light blue flowers 2cm long on erect, leafy stems

  • Plant range Croatia

Characteristics

  • Foliage Deciduous

  • Habit Bushy

  • 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)

    H5

Colour

Sunlight

  • Full Sun

  • Partial Shade

  • Aspect South-facing or North-facing or West-facing or East-facing

  • Exposure Exposed or Sheltered

Soil

  • Sand

    Sand

  • Chalk

    Chalk

  • Loam

    Loam

  • MoistureWell-drained

  • SoilSand, Chalk, Loam

  • pHAcid, Alkaline, Neutral

Size

  • Ultimate height Up to 10 cm

  • Ultimate spread 0-0.1 metre

  • Time to ultimate height 1-2 years

How to grow

Cultivation Grow in gritty, moist but sharply drained soil in full sun. Suits a scree bed trough or alpine house in loam-based potting compost (JI No.1) with plenty of grit. Ideal for sunny wall or rock crevice planting

Propagation Propagate by seed in containers in an open cold frame in autumn. Take cuttings of new growth in early spring or summer

Suggested planting locations and garden types Banks and Slopes Garden Edging City & Courtyard Gardens Cottage & Informal Garden Gravel Garden Patio & Container Plants Rock Garden

How to care

Pruning No pruning required

Pests vine weevil may be a problem under glass. Vulnerable to slugs and snails

Diseases Powdery mildew may be problematic

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