New Castle keeps its old stone walls, and the lawns running up to them have to be cut in a way that meets that line honestly. Byram Lawn Care mows, trims and edges through the Chappaqua and Millwood corners of town, where the Saw Mill threads its valley and the hills throw long shade by four in the afternoon. Westchester ground is heavy and root-bound under oak and beech, so a lawn here is a negotiation rather than a given. Cleanups in April and again in November do half the job; the weekly cut and a tight edge handle the rest. Step out on a June evening after the mowers have gone and the whole street looks composed.