To grow moss: Add cup of live culture yogurt, blend with handful (1/4-1/2 cup) sphagnum moss or sample live moss from your area (best because it's adapted to your climate). Can also add splash of buttermilk and/or flat beer, pinch of sugar. Paint on with brush, keep moist using spray bottle or mist hose setting. Growth within 2 weeks. Experiment for best formula.