Do the ferns only grow on the north side of the moss?
Nope - just about any place the moss is thick enough. We're at the head of a 60 mile channel, so it's "pretty dry" compared to the first mountains that intercept the incoming Pacific weather systems on the outer coast. There are ferns and flowers growing in the moss that's growing on the branches of the trees out there, but it never snows over 4' in a day, so I like it better here
Note to self: Turn your negatives into positives.