Thuja plicata

Distribution

Thuja plicata is among the most widespread trees in the Pacific Northwest. It is associated with Douglas-fir and western hemlock in most places where it grows. It is found at the elevation range of sea level to a maximum of 2,290 m (7,510 ft) above sea level at Crater Lake in Oregon.^[4] In addition to growing in lush forests and mountainsides, western redcedar is also a riparian tree, growing in many forested swamps and streambanks in its range.^[5] The tree is shade-tolerant and able to reproduce under dense shade.^[6]

It has been introduced to other temperate zones, including western Europe, Australia (at least as far north as Sydney), New Zealand,^[7][8] the eastern United States (at least as far north as Central New York),^{[citation needed]} and higher elevations of Hawaii.^[9]

The species is naturalized in Britain.^[10]