QuestionsHow to growLawnsMossTime to treat lawn moss 0 Vote Up Vote Down Elizabeth Ironside asked 10 years ago correct time of year to treat the lawm for moss 1 Answers 0 Vote Up Vote Down Gerry Daly Staff answered 6 years ago Autumn or spring are usually best. MO-bacter is a product used in early summer. Â more at: Â https://gardenie.wpengine.com/gerrycategory/moss/?id=5387