Spring comes up the Sing Sing Kill first, the creek loud with melt and the ravine green a full week before any lawn in Ossining catches up. Zaruma & Sons Landscaping Inc. starts its year right there, with the first cut — mowing, tidying the ragged winter edges, clearing the beds and shaping the borders until a yard looks intentional again. Through the summer it stays steady mowing and edging on hillside properties, where a level stripe is something you have to earn. Then the wind off the Hudson turns raw, the slopes go white, and the work becomes snow removal: plowing, opening the walkways, treating the ice that settles on a north-facing drive and refuses to leave. Ossining is the center of it, with Briarcliff Manor, Croton-on-Hudson, Pleasantville and Yorktown Heights near at hand.