photography-moss-nature-northside-swittersbWell, generally speaking moss is on the North side of trees, if you live in the Northern hemisphere. But, in the Southern hemisphere, moss can be mostly on the South side of the tree. Moisture content, sunlight, evaporation all contribute to where moss grows and to what degree. On this old, gnarly tree, the moss was decidedly on the North side of the tree (in Oregon). (more here about moss)