Pull up all of the weeds or turf grass in the lawn. Remove any twigs, rocks and debris. Rake the topsoil flat.
Cut a flat of Scotch moss into four squares of equal size with a utility knife. Lay the squares on the soil of the lawn, 6 inches apart.
Repeat with each flat of Scotch moss until you have covered the entire lawn with moss squares spaced 6 inches apart. Water the moss until the soil is moist.
Put a handful of Scotch moss and 1 cup of beer into a blender. Blend for 30 seconds then pour the mixture into a spray bottle. Mist the moss patches with the spray, once a week, to encourage its spread.
Pull up any weeds that appear in the bare patches of soil while the moss is spreading. Water frequently enough to keep the soil moist but do not water-log the soil or create standing puddles.