Native to the western region of North America. Narrow and column-shaped in the northernmost region, but becoming somewhat conical in shape towards the south. When trees are old, the trunk is reddish brown and flakes off in long sheets. The scales on the reddish brown twigs fan out over each other as they grow. There is little difference between the top and bottom. Calocedrus decurrens is a monecious tree, with female and male flowers growing on different branches. The small ovoid, hanging cones are hook-shaped at the top. This is a clear characteristic of Calocedrus. Often only the centre scales bear seeds. Calocedrus grows in any type of soil that is not too wet and tolerates calcareous soil. It is susceptible to Phytophthora in moist soil. The wood is easy to work with and aromatic. Calocedrus decurrens develops a somewhat flakey trunk with a warm reddish-brown colour at a later age. The aromatic wood, which is easy to work, is used for making pencils.