However, iron will not always kill the moss. It may “burn” the moss severely and render the plant very weak. If the moss is to be eliminated, it must be removed and grass seed sown into its place for a thick turf. … Moss can be controlled with products containing Iron Sulfate, and Ferrous Ammonium Sulfate.

How much iron does it take to kill moss?

Mix the liquid iron at 2 oz per quart of water, 8 oz per gallon. Using a pump or trigger sprayer, wet the moss well with the iron solution, being careful to avoid spraying the grass. Test a small area first–the moss should turn blackish brown within 24 hours.

What kills moss permanently?

• For small patches, mix in a garden hand sprayer 2 ounces of dish soap and 1 gallon of water. …
• Spray the mixture on the patches of moss. …
• The patches of moss will turn orange or brown in 24 hours and eventually dry up. …
• After raking up the dead moss, take it to an isolated area.