Katonah sits among reservoir water and oak ridges, where old stone walls run off into the woods and the roads still follow the shape of the land. Cedar Hills Landscaping, Inc. keeps those lawns cut even all summer, then turns to the plow once winter takes the hills. Warm-weather work is mowing, trimming and edging under all that shade, with cleanups to open the beds in April and clear the leaves in November. Cold-weather work is drives and walks opened early, salt where the shaded corners glaze over, and the return trips a long storm demands. Either season, the aim is a Westchester property that looks settled and stays easy to use.