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AGM plants have been through a rigorous trial and assessment programme. They are:
This plant will provide nectar and pollen for bees and the many other types of pollinating insects.
It is included in an evolving list of plants carefully researched and chosen by RHS experts. Divided into 3 groups these lists, linked below, are maintained by a team of RHS staff and are reviewed annually.
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Other common names western red cedar British Columbia cedar
Californian white cedar giant arbor-vitae Nootka Sound arbor-vitae western arbor-vitae yellow cypress
Synonyms Thuja gigantea Thuja lobbii
Family Cupressaceae
Genus Thuja are fast-growing evergreen trees of narrowly conical habit, with flat sprays of tiny, aromatic, scale-like leaves and small knobbly cones
Details T. plicata is a large, evergreen, narrowly-pyramidal tree reaching an ultimate height of up to 35m. Aromatic, glossy, scale-like, sharply-pointed leaves are held in large drooping sprays on spreading branches that curve upwards at the end. Cones are egg-shaped and around 1.3cm long
Plant range W North America
Foliage Evergreen
Habit Columnar/Upright
Fragrance Foliage
Toxicity Contact with foliage may irritate the skin. Wear gloves and other protective equipment when handling
Hardiness
All ratings refer to the UK growing conditions unless otherwise stated. Minimum temperature ranges (in degrees C) are shown in brackets
H6
Full Sun
Partial Shade
Aspect North-facing or West-facing or South-facing or East-facing
Exposure Exposed or Sheltered
Chalk
Clay
Loam
Sand
MoistureMoist but well-drained, Well-drained
SoilChalk, Clay, Loam, Sand
pHAcid, Alkaline, Neutral
Ultimate height Higher than 12 metres
Ultimate spread wider than 8 metres
Time to ultimate height 10-20 years
Cultivation Grows best in moist but well-drained soil. Protect from drying winds especially when young. Suitable for hedging or screening
Propagation Propagate by semi-hardwood cuttings
Suggested planting locations and garden types Hedging & Screens Low Maintenance Architectural
Pruning None required, unless grown as a hedge
Pests May be attacked by scale insects and conifer aphids
Diseases May be subject to coryneum canker (see Conifers: brown patches)
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The Royal Horticultural Society is the UK’s leading gardening charity. We aim to enrich everyone’s life through plants, and make the UK a greener and more beautiful place.