QuestionsHow to growLawnsMowingNew Lawn 0 Vote Up Vote Down Ronan Scroope asked 9 years ago i have put down a new lawn four weeks ago and i am just wondering for the first few cuts will i collect the grass or is it best to mulch it without the box on the lawnmower. 1 Answers 0 Vote Up Vote Down Gerry Daly Staff answered 6 years ago It makes little or no difference. Remove if the cover is heavy.