QuestionsHow to growLawnsMossLawn care 0 Vote Up Vote Down Bernadette Conneely asked 13 years ago When is the best time to scarify a lawn? 1 Answers 0 Vote Up Vote Down Gerry Daly Staff answered 6 years ago Scarification can be done to remove moss and dead thatch in late March when growth is picking up so it does not look bare for too long. Over-sow with grass-seed to thicken the lawn and apply some lawn feed also.