Around the middle of October the bur oaks let go nearly all at once, and half of Harlem wakes up to a yard buried under brown. Dan Greens Lawn Service, Inc. answers that with cleanups — leaves pulled off the turf, beds and walks blown out, the lawn given room to breathe before the ground locks up for good. Through the growing months it is mowing, trimming and edging on a steady rotation, the kind of upkeep that makes the fall work go easy. A yard tended all season takes its winter better; that shows up again in April. Serving Harlem and the towns close by, from the first green of spring to the last leaf down.