Dusk at the Duck Pond in summer, the water going pewter and the last light caught in the tops of the oaks — Mamaroneck looks older and greener than a town this close to the city has any right to. Jade Garden Design tends lawns in that setting, mowing and trimming on a set rhythm and cleaning up as one season hands off to the next. Grass under mature canopy is a slow, particular thing; it wants a higher cut, a lighter touch, and patience through August. Done well, the lawn becomes the calm floor that everything else in the yard stands on. That quiet, level green is the entire ambition.