Question: I have noticed that my grass stays green longer if I leave tree leaves on top of it. Is that a satisfactory process?

Answer: No. It encourages disease in the moist, dark conditions. Also, should a January cold front blow those leaves away, suddenly your grass could be exposed to severe cold for the first time, and damage could be equally severe. Plus, your landscape would look so untidy. It’s better just to keep the leaves picked up and let the grass go dormant naturally.