• 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

Chamaecyparis lawsoniana 'Chilworth Silver'

Lawson's cypress 'Chilworth Silver'

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
Lawson's cypress 'Chilworth Silver'

© � RHS 2003

  • Other common names Lawson's cypress 'Chilworth Silver'

  • Synonyms Chamaecyparis lawsoniana 'Nyewoods'

  • Genus Chamaecyparis are evergreen trees, usually of narrowly ovoid or columnar outline, with much-branched sprays of small scale-like leaves, and small, globose cones; tiny red male cones are conspicuous in a few cultivars

  • Family Cupressaceae / Cupressaceae

  • Details 'Chilworth Silver' is a slow-growing medium-sized evergreen shrub of broadly columnar habit, with dense, soft sprays of bright silvery-blue, semi-juvenile foliage

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)
    Old hardiness ratings

    While we update our systems with the new hardiness ratings you may still see old hardiness ratings in your search results. These are denoted as 'Old'.

    • H1 - Requires heated glass
    • H2 - Requires unheated glass
    • H3 - Hardy outside in some regions of the UK
    • H4 - Hardy throughout the UK
    • H1 + H3 - Requires heated glass but may be grown outside in summer

    For full details of the hardiness ratings see

    see more

    H6

Colour

Sunlight

  • Full Sun

  • 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

  • MoistureMoist but well-drained

  • SoilChalk, Clay, Sand, Loam

  • pHAcid, Neutral

Size

  • Ultimate height

    1.5-2.5 metres

  • Ultimate spread

    0.5-1 metres

  • Time to ultimate height

    10-20 years

How to grow

Cultivation Grows well in moist but well-drained soil. Tolerant of chalk soils but prefers slightly acidic soil. Slow growing

Propagation Propagate by grafting and semi-hardwood cuttings

Suggested planting locations and garden types Flower borders and beds Hedging & Screens Low Maintenance Architectural City & Courtyard Gardens Rock Garden

How to care

Pruning No pruning required, but shaped subjects, including hedges, will need trimming twice a year.

Pests Aphids can cause severe die-back, also gets juniper scale and shoot-boring moths

Diseases May be affected by honey fungus and Phytophthora root diseases

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