Old stone walls run through the fields around Black Lake, and every one of them makes a lawn harder to finish neatly. Rock Bottom Home & Lawn Service mows right up to them, then takes the last few inches with a hand line so the grass ends exactly where the stone starts. Through the season the cut stays even across ground that rolls a good deal more than it looks like it does. Cleanups bookend the year: the twigs and flattened grass of a Catskill spring, then the deep leaf fall that arrives all at once in late October. Between them are the ordinary weeks — a machine going by, a yard that keeps its shape.