Rowayton light does something particular in early autumn — low over the Five Mile River, catching the top of every stone wall on its way inland. Norwalk Landscaping Company builds those walls and a good deal more: retaining walls, natural stone walls and steps, concrete or paved patios, walkways and fire pits, plus hardscape repairs when a hard frost has shifted an old one out of true. The growing months run on weekly, bi-weekly or monthly lawn maintenance, garden design and installation, seasonal upkeep, soil rotation and aeration, drip irrigation and sprinkler systems that conserve water, and tree work that ranges from trimming, pruning and shaping to mulching, fertilizing, cabling, bracing and wound repair. Insect control sits on the list too. Then the cold arrives and the same crews turn to moving snow off the ground they spent the summer shaping. Darien, Fairfield, Greenwich, New Canaan, Stamford, Westport and Wilton fill in the map around Norwalk.