Disney world does this! Lowes sells the 4 to 6" round PVC pipe with holes already drilled. Purchase an end cap, fill with rock, soil, and plant. I will often put these in the center of a very large pot to stabilize, and add amazing height and color to a container that has trailing plants (no end cap or rock needed if you are placing in a container)
Beautifully simple moss urn. how to grow moss.Take a clump of healthy moss and crumble it into your blender. Add 2 cups of buttermilk and 2 cups of water. Blend at the lowest speed until it is completely mixed and the consistency of a thin milk shake. (add water if necessary) Paint the mixture onto rocks, pots or statuary, or simply pour it on the ground wherever you'd like your moss to grow!