Thuja plicata, or western red cedar, is non-native to Ontario originating in the Pacific Northwest, extending from southern Alaska along the Pacific coast to northern California, and eastward into the northern Rockies of British Columbia and Montana. It grows best in humus-rich, well-drained soils, and is adaptable to different pH levels but does not tolerate drought or dry winds. Due to its shallow rooting and intolerance of high/dry head, it is not recommended for planting in urban areas.