Out toward the Galway line the sugar maples along the old stone walls go over all at once in October, and a week later every lawn in Ballston is under six inches of them. Wolffys Landscapes L.L.C. handles that reckoning — fall cleanups, leaf and debris removal, plus the mowing, trimming, edging and mulch work that carries a property through the rest of the year. Clearing a lawn before the leaves mat down and smother it is the difference between a green April and a bald one. There's real pleasure in the last pass of the year, when the turf comes up tight and bare and ready for the cold. Then the walls come back into view and the season closes clean.