I have heard a rumor and I am wondering if it is true. A rock wall placed in a shady area, but the rocks have no moss on them. I hear that you can take moss off of exhisting rocks, but it in a blender with butter milk and make a "moss shake". Then put that shake in a pump up sprayer and apply the mixture to the rocks and it will grow, as long as it has the right amount of shade and moisture..... Fact or fiction?