Here are some photos of trees with moss on the soil. The moss on these trees were developed using my mossing techniques described HERE. The key to successful moss growing is select the right moss to start with. Moss already growing in full sun is the best and my mossing technique will be help get your moss started off in the right direction. The closeup photo of moss/pot details is right after the moss was applied to the soil, a couple months latter you can see the difference in the photo with the Oak tree in it.