Grass grown in shade is normally thinner than grass grown in full sun. Foot and vehicle traffic easily damages grass in shaded areas, and should be restricted whenever possible.
Traffic also increases soil compaction, especially when the soil is wet.
In the fall, it is critical that leaves be promptly raked up or pulverized with a rotary mower so they are mulched into the turf. Leaves left on the ground as is will eventually smother the grass. Fertilization - Shaded areas need to be fertilized at lower rates than sunny areas because growth is less. Light applications of fertilizer for the grass but deep-root feeding of trees is best. Heavy fertilization will give succulent turf growth that is prone to disease and traffic damage.