Pembroke Street runs long and straight along the ridge, with the Merrimack meadows dropping away to the west and Concord's lights showing after dark. All Seasons Landscaping & Excavation LLC keeps lawns on that road and in the neighborhoods below it — mowing, trimming, edging, mulching, and cleanups when the season opens and closes. River-bottom ground grows grass with genuine enthusiasm, which means the mowing calendar is not a suggestion from May into September. Cut on time, a lawn here stays even and dense and honest-looking from the street. When the maples give up in October, those same yards get raked out and set right for the cold.