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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 'Atrovirens'
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 'Atrovirens' is a fast-growing, conical, evergreen conifer making a medium-sized tree with red-brown bark and aromatic, rich green foliage in spreading or drooping sprays
Foliage Evergreen
Habit Bushy
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
Aspect West-facing or South-facing or North-facing or East-facing
Exposure Exposed or Sheltered
Chalk
Clay
Loam
Sand
MoistureMoist but 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 20-50 years
Cultivation Grow 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 Flower borders and beds Hedging & Screens Cottage & Informal Garden
Pruning No pruning required
Pests May be attacked by scale insects and conifer aphids
Diseases May be subject to coryneum canker
RHS members can get exclusive individual advice from the RHS Gardening Advice team.
western red cedar 'Atrovirens'
Buy from £24.99 at the RHS Plants Shop
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.