We have a large fireplace made of rocks from the Craters of the Moon park in Southern Idaho. The rocks are very rough and already have some dry moss on them, but really, the whole thing's a kind of eye sore, to me; I prefer river rock. So I started thinking maybe I could get moss and other small plants to grow on the moon rocks. Then it would be quite beautiful!
Our climate is dry and there is no direct light on the rocks. Would I need lighting and some way of misting the moss daily? Any ideas on how best to do this?