• 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

Carpinus betulus 'Columnaris'

common hornbeam 'Columnaris'

  • Other common names common hornbeam 'Columnaris'

  • Family Betulaceae

  • Genus Carpinus are deciduous shrubs and trees with attractive foliage and hop-like fruit clusters in late summer and autumn

  • Details 'Columnaris' is a slow-growing, deciduous tree to 8m tall, spire-like when young with densely-branched and leaved growth before maturing to form an ovoid crown. Its ovate, serrate and ribbed leaves turn yellow in autumn

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)

    H7

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

  • Clay

    Clay

  • Chalk

    Chalk

  • Loam

    Loam

  • MoistureWell-drained, Moist but well-drained

  • SoilSand, Clay, Chalk, Loam

  • pHAcid, Alkaline, Neutral

Size

  • Ultimate height 4-8 metres

  • Ultimate spread 2.5-4 metres

  • Time to ultimate height more than 50 years

How to grow

Cultivation Grow in a fertile, well-drained soil in full sun or partial shade

Propagation Propagate by softwood cuttings or by grafting

Suggested planting locations and garden types Flower borders and beds Architectural

How to care

Pruning Pruning group 1

Pests Generally trouble free but may be attacked by caterpillars and aphids

Diseases Powdery mildews and coral spot may occur

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