By the third week of October the silver maples along the avenues let go all at once, and Elmwood Park turns gold and ankle-deep overnight. David Knopf Landscaping works that tide: leaves lifted off the lawns and out of the fence corners, perennials cut back, the final mow taken low so nothing mats down under winter. The green months before it are steadier work — mowing, edging, trimming, hedges kept honest, borders freshened. Then the borough goes bare and the whole cycle waits for April. A lawn put to bed properly comes back in spring looking like someone was thinking ahead.