Spring reaches Rumson slowly, held back by the rivers on both sides, and then all at once the dogwoods around Victory Park open and the town goes green. Harrington Landscape LLC starts its season there and stays with it: mowing, edging, trimming, and the cleanups that bracket the year at either end. Evening is the best hour to judge the result — long shadows lying across the grass, borders sharp, beds swept out. A lawn is one of the few things a household looks at every single day of the week. Keeping it right is worth doing on a schedule.