This section is from the book "Commercial Gardening Vol4", by John Weathers (the Editor). Also available from Amazon: Commercial Gardening, A Practical & Scientific Treatise For Market Gardeners.
A beautiful Californian Conifer, 50-150 ft. high in a native state. It is often erroneously called Thuya gigantea, but may be recognized by its small, linear, bright glossy leaves, imbricating in four rows on the plaited or flattened branchlets, and by its solitary olive-brown cones, about 1 in. long, at the tips of the shoots. More tender kinds are Doniana and tetragona.