× Cuprocyparis notabilis

RHS Plant Profile

noble cypress

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Other common names

Alice Holt cypress

Synonyms

× Cupressocyparis notabilis

Conifers Trees

An evergreen conifer to 15m tall or more, broadly conical in habit, with rather lax sprays of blue-green, scaley leaves and small, globose grey-green cones

Position

Full sun, Partial shade

Soil Types

Chalk, Clay, Loam, Sand

Max Height

Higher than 12 metres

Max Spread

4-8 metres

Size

Time to Maturity: 10–20 years
Max Spread: 4-8 metres
Max Height: Higher than 12 metres

Growing Conditions

Chalk Clay Loam Sand

Moisture: Well–drained
pH: Acid or Alkaline or Neutral

Position

Full sun Partial shade

Aspect: South–facing or West–facing or East–facing
Exposure: Exposed or 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): H6

Colour & Scent

Season	Stem	Flower	Foliage	Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family: Cupressaceae
Native to GB/Ireland: No
Foliage: Evergreen
Habit: Bushy
Potentially harmful: Foliage may cause skin irritation. Wear gloves and other protective equipment when handling
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
Name Status: Correct

How to Grow

Cultivation

Grow in well-drained soil and full sun or partial shade

Propagation

Propagate by semi-ripe cuttings in late summer

Suggested planting locations and garden types

Coastal
Cottage and informal garden
Flower borders and beds
Hedging and screens

Pruning

No pruning required. Old wood will not resprout

Pests

May be susceptible to conifer aphid and scale insects

Diseases

May be susceptible to a bacterial canker and honey fungus; see Conifers: brown patches