Door, Kewaunee, and Manitowoc Counties in NE Wisconsin contain some of the best Thuja occidentalis in the state, likely the world. The dolomite bedrock supplies all the calcium and magnesium this species so likes. Therefor, it is not at all unusual to see fine stands of this tree throughout this area. But where Highway 42 goes up into Door county-actually just before that, while still in Kewaunee Cty, is a most unusual area. The limestone is right at the surface, and while this always favors the Thuja, this area is extremely odd because along with that tree are numerous Juniperus virginiana, almost as if that tree had the exact same preferences. Otherwise, they seem to occupy opposite ends of the scale, insofar as preferences, needs, etc. The juniper, of course, can be found just about anywhere, including very dry locations, while the Thuja is very well-known for its tolerance of high water tables. I have never----I really do mean never, seen these trees together, but for a few miles in this area, they are all over each other.
I don't know if anyone else appreciates that this is an odd pairing, but it jumps right out at me whenever we're cruising up that way. Just a bit further north...or south for that matter, and it's all Thuja again, with its usual associates. But for these few miles, this odd combo really has taken hold.