Moss does not kill or harm grass. It is an opportunistic plant that grows in areas that lack lawn growth and appear bare. Many homeowners find moss within a lawn to be unsightly. Moss occurs when a lawn is weak, sick, suffers from excessive thatch or lacks nutrients to flourish. Encouraging a healthy lawn throughout the year will prevent moss from becoming a problem. Once moss establishes itself in a lawn, a homeowner can easily take steps to remove it and then focus on prevention of future moss growth.
Mix 3 oz. iron sulfate with 5 gallons of water in a garden sprayer. Spray the areas of moss using the garden sprayer. Spray only 1,000 square feet of moss with 5 gallons of water. Moss will begin to turn brown and die within two weeks of application.
Spray the moss using copper sulfate if the iron sulfate does not adequately kill the moss after two weeks, or the moss begins to regrow. Mix 2 to 5 oz. of copper sulfate into 4 gallons of water in a garden sprayer. Spray over 1,000 square feet of lawn.
Rake away the dead moss and dispose of it. Raking will also help dethatch the lawn.
Apply lime to the lawn once the moss is removed if the soil does not have a pH between 6.5 to 7. Soil that is below 6 is considered to be acidic, and moss flourishes in acidic soil. Applying lime will help the soil attain a more alkaline structure to prevent future moss growth. Follow the directions on the lime label for application.