Side by side

Western red cedar or northern white cedar? How to tell them apart

Thuja plicata · Thuja occidentalis

How to tell them apart – western red cedar: glossy dark green foliage with white patches underneath that smells of pineapple, becomes a large tree; northern white cedar: dull yellowish-green foliage without white patches that turns brownish in winter, stays smaller.

Western red cedar (Thuja plicata)

Photo: Jean-Pol GRANDMONT, CC BY-SA 3.0 · source

Western red cedar Thuja plicata

Northern white cedar (Thuja occidentalis)

Photo: André Karwath aka Aka, CC BY-SA 2.5 · source

Northern white cedar Thuja occidentalis

How do you recognise them?

Western red cedar
Large thuja with glossy dark green scale leaves that smell of pineapple when crushed; white patches underneath.
Compared with northern white cedar: glossy dark green foliage with white patches underneath that smells of pineapple; becomes a large tree.
Northern white cedar
Thuja with dull, yellowish-green scale leaves without white markings underneath, which turn brownish in winter.
Compared with western red cedar: dull yellowish-green foliage without white patches that turns brownish in winter; stays smaller.
Western red cedar and northern white cedar side by side
Western red cedarNorthern white cedar
NeedlesScale leaves in flat, slightly drooping sprays; glossy dark green above, with white patches below. Crushed, they smell sweetly of pineapple.Scale leaves in flat, fan-like sprays; dull green above, paler yellowish green below without white patches. Crushed, they smell strong and fruity, rather like apple. Often brownish in winter.
Flowering––
Cones and seedsUpright, elongated cones 1–1.5 cm long with 10–12 scales that open like a small flower.Upright, egg-shaped cones about 1 cm long with 8–10 thin scales; yellowish green at first, brown when ripe.
BarkReddish-brown, in long, soft, fibrous strips; the base of the trunk is often broadly flared and fluted.Reddish-brown to grey, in narrow, fibrous strips.
Shape and heightConifer, 25–40 mConifer, 10–20 m (in gardens usually 3–10 m)
SiteSun to shade, any garden soil, normalSun or partial shade, any garden soil, normal
Native to BelgiumNo, plantedNo, planted
Good for bees, butterflies and birds––
Poisonous to people and petsYes, take care with children and petsYes, take care with children and pets
Pruning monthsMay–June and August–SeptemberMay–June and August–September

What does it mean for your garden?

  • Western red cedar is poisonous to people and pets: take care with children and animals.
  • Northern white cedar is poisonous to people and pets: take care with children and animals.
  • Western red cedar (25–40 m) and northern white cedar (10–20 m (in gardens usually 3–10 m)) both grow into large trees: too big for an ordinary garden, but fine in a large garden, a park or a meadow.

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This comparison is compiled from the Bladwijzer species pages.

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