We recommend mulching leaves, as they will add nutrients to your soil and make for a healthier lawn. Raking up the leaves will not harm your lawn, but you’ll also be missing out on the benefits leaves provide. One note of caution, do not ignore blankets of full leaves on your lawn, either raking or mulching is necessary. If you don’t, the leaves can actually do more harm than good since they’ll block sunlight and air from getting to the grass. This problem can be compounded when it rains, eventually leading to turf diseases or dead grass.