DIY GARDEN :: MOSS Growing Tutorial :: 39.95 at Williams-Sonoma or DIY?: Wash your pot, statue, stone well & air-dry 72 hrs. min. Mix 1/2 c. natural preserved (pre-soaked in water) or live moss, in a blender w/ a cup buttermilk, some plain yogurt, can of beer & 2 tsp. sugar til soupy. (Or just mix yogurt OR buttermilk, moss & water.) Sponge brush onto the surface. Set pot inside a dark area inside a plastic grocery/trash bag. Loosely tie shut. After 3 days, remove bag revealing growing moss!