Thuja plicata, commonly known as western red cedar, is a large evergreen conifer native to the Pacific Northwest and revered as the 'Tree of Life' by Indigenous peoples. Seeds have relatively short dormancy and germinate readily with cold stratification, requiring light and consistent moisture for successful establishment.
Before sowing
Cold stratification is beneficial for improving germination rates. Seeds can germinate without stratification in natural autumn conditions but stratification significantly increases germination success.
Sowing
What to expect
Tips
Fall sowing directly outdoors in mulched beds is a practical alternative to indoor stratification. Seeds require light to germinate—do not cover with thick soil. Maintain high humidity during germination to prevent seedling damping-off. Seedlings are highly sensitive to drying and may suffer fatal root damage if moisture is lost. Provide strong indirect light rather than full direct sun during germination.
Sources: University of Washington Propagation Program, Sheffield's Seeds, Twining Vine Garden, Tree Seed Online, Missouri Botanical Garden, USDA Forest Service
