Thuja plicata
Common Name: western red cedar 
Type: Needled evergreen
Family: Cupressaceae
Native Range: Western North America
Zone: 5 to 7
Height: 50.00 to 70.00 feet
Spread: 15.00 to 25.00 feet
Bloom Time: Non-flowering
Bloom Description: Non-flowering
Sun: Full sun to part shade
Water: Medium
Maintenance: Medium
Suggested Use: Hedge, Rain Garden
Leaf: Fragrant, Evergreen
Tolerate: Clay Soil, Black Walnut


Best grown in moist, fertile, well-drained soils in full sun to part shade. Thrives in cool summer climates. Intolerant of dry conditions. Best in full sun, but generally appreciates some light afternoon shade in hot summer climates. It may struggle in the St. Louis area which has considerable different climate and soil conditions than the native habitat of this conifer.

Noteworthy Characteristics

Thuja plicata, commonly called western red cedar or giant red cedar, is native to the Pacific Northwest where it is typically found in cool but moist forest areas and bottomlands from southern Alaska along the Pacific coast to northern California and in the northern Rockies from British Columbia to Montana. This is the largest tree in the cypress family, growing in its native habitat to 100-200’ tall and living from 400 to 1000+ years. It features horizontal branching with sprays of scale-like dark green foliage that is aromatic when crushed. Fibrous, aromatic, reddish-brown bark. Small, upright, light brown seed cones (to 1/2” long).

Genus name is the Greek name for a kind of juniper (Juniperus.)

Specific epithet means pleated.


No serious insect or disease problems. Bagworm and rots may occur. These plants may struggle in the St. Louis area where environmental conditions do not favor most conifers.


Large specimen tree for lawns, backgrounds. Young trees can be pruned as a hedge or screen.