Most people are confused regarding the differences between the Western Red Cedar and Eastern Red Cedar trees. The Western Red Cedar is also referred to as the Pacific Red Cedar, and the genus is Thuja. It is found mostly in the Pacific Northwest in the United States. It is located from sea level to an elevation of 7500 feet. Though it originates from the Pacific Northwest, there are imports in temperate climates such as Western Europe. Australia and New Zealand. This tree does not need much sunlight and can thrive in dense shade.