This is not your typical arborvitae (Thuja occidentallis or Eastern White Cedar). It is Western Red Cedar. A native plant to western North America. It is not a wetlands plant. It grows in the mountains in fact. It also has a pretty good tolerance to shady conditions. I've stood on 12' diameter stumps of these in Idaho. They usually hollow out with age, but are used a lot for western split cedar fencing that most of you have seen. I also had a unique experience of burning the slash on a 25 acre selective cut of these that crossed the ridge of a small mountain range (~5,000 elevation). This stand was growing over the ridge rather than in a wetland. One hundred + degree summers and an occassional -50 in the winter and about 30" of rainfall per year, almost all between October and June and in the form of snow. Very low humidity year 'round where this stand was. Heavy silt soil. (conditions specific to the stand that I dealt with, not necessarily what is best forthem. Very cool tree which also has pretty high value as timber.