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Thuja occidentalis 'Smaragd' AGM

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© RHS 2003

Characteristics

Plant type

Conifer or Shrub

Habit

Bushy

Toxicity

Contact with foliage may irritate the skin

Resilience

Hardiness

H6 (hardy - very cold winter)

Colour

Foliage

Green in Autumn, Spring, Summer and Winter

Size

Ultimate height

1.5-2.5 metres

Ultimate spread

1.5-2.5 metres

Time to ultimate height

10-20 years


Preferred common name

white cedar 'Smaragd'

Family

Cupressaceae


Thuja are fast-growing evergreen trees of narrowly conical habit, with flat sprays of tiny, aromatic, scale-like leaves and small knobbly cones

'Smaragd' is an evergreen conifer making a slow-growing conical shrub with erect sprays of bright green foliage

Synonym(s)

  • Thuja occidentalis EMERALD
  • Thuja occidentalis 'Emeraude'

How to grow

Sunlight

  • Full sun

Aspect

  • South-facing, West-facing or East-facing
  • Exposed or Sheltered

Cultivation

Grow in moist but well-drained soil. Protect from drying winds especially when young

Soil

  • Moist but well-drained
  • Acid, Alkaline or Neutral
  • Sand, Clay, Chalk or Loam

Propagation

Propagate by semi-hardwood cuttings

Suggested planting locations and garden types

Architectural, City/Courtyard Gardens, Cottage/Informal Garden, Flower borders and beds, Low Maintenance, Patio/Container Plants or Rock Garden


How to care

Pruning

No pruning required

Pests

May be attacked by scale insects

Diseases

May be subject to a canker