September light on the hills above Crystal Lake comes in long and gold, and the lawns hold their color right through it. HillDale Landscapes works with that grade — mowing across a slope, edging clean along the drive, trimming where the ground drops away, mulch to keep beds from washing out, spring and fall cleanups with the leaves cleared as they fall. Winter brings the other list: plowing, shoveling, snow blowing, sand and salt on a hill that would happily send a car sideways. A pitched property asks more of everyone, and doing it carefully shows from the road. Haverhill and the towns that ring it.