From the rise at Oyster Shell Park you can see how Norwalk fits together — the river bending under the bridges, the harbor opening beyond it, the neighborhoods stepping back up the hills on either side. Xum Landscaping works those hillside yards, where a lawn can run flat in front and drop away hard behind: mowing, trimming, edging along walks and retaining walls, cleanups at both ends of the growing season. Sloped ground asks for a careful pass and a patient one, since rushing it leaves marks that stay visible all summer. Cut evenly across the grade, a Norwalk hill lawn looks twice the size it really is.