LEAF DECOMPOSITION RATES VARY
If your yard has mostly small, thin, or fine textured leaves, such as an abelia shrubs and Japanese maples, these decompose much more rapidly than waxy witch hazel, magnolia or oak leaves which may take a season or two to breakdown. For light leaf loads, a good solution is to repeatedly mow over these leaves with a mulching mower such that they break down and will be incorporated into the soil. If leaves dropped on a nice slow predictable schedule, it would be easy to mulch fine textured leaves into turf grass each week. But that’s not what typically occurs.
If the trees on your property have thicker larger leaves, or there are a lot of leaves dropping at once and you want your turf grass to thrive, you’ll want to move them off your turf areas. Turf grass requires sunlight for photosynthesis. If leaves cover the grass for weeks or months, the turf blades yellow and take a while to recover once the leaf cover is removed. If you have loads of leaves totally shading your turf for months, you may end up with bare spots and fungal growth.