• 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

× Cuprocyparis leylandii

Leyland cypress

Leyland cypress

© RHS 2003

  • Other common names Leyland cypress

  • Synonyms Callitropsis × leylandii
    Chamaecyparis × leylandii

    Cupressus × leylandii
    × Cupressocyparis leylandii
    × Hesperotropsis leylandii

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  • Family Cupressaceae

  • Genus × Cuprocyparis are large, very fast-growing evergreen trees of narrowly conical or columnar habit, with tiny scale-like leaves in dense sprays, and small spherical cones

  • Details x Cuprocyparis leylandii is a very fast-growing evergreen tree to 35m, flame-shaped in outline, with small dark green scale leaves in flat sprays

Characteristics

  • Foliage Evergreen

  • Habit Columnar/Upright

  • Toxicity Foliage may cause skin irritation

  • 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)

    H6

Colour

Sunlight

  • Full Sun

  • Partial Shade

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

  • Exposure Exposed or Sheltered

Soil

  • Chalk

    Chalk

  • Chalk

    Clay

  • Chalk

    Sand

  • Chalk

    Loam

  • MoistureWell-drained

  • SoilChalk, Clay, Sand, Loam

  • pHAcid, Alkaline, Neutral

Size

  • Ultimate height Higher than 12 metres

  • Ultimate spread 2.5-4 metres

  • Time to ultimate height 10-20 years

How to grow

Cultivation Grow in well-drained soil. Suitable for hedging but requires regular trimming. Fast growing

Propagation Propagate by semi-hardwood cuttings

Suggested planting locations and garden types Hedging & Screens Architectural

How to care

Pruning No pruning required, but can be trimmed and shaped as required as long as cuts are confined to young green shoots. Old wood will not resprout

Pests Can get conifer aphids and scale insects

Diseases May be subject to a canker

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