On a June evening the light comes sideways through Bare Cove Park and lays itself flat across the tidal grass of the Weir River. Green Concept Landscaping spends hours like those finishing up — the last pass of the mower, the trimmer around the fence posts, the clippings blown back off the walk. Lawns on this side of Hingham surge in early summer and then want patience through August, and the route bends to that. Borders are recut, mulch laid, shrubs kept off the windows, and leaves taken down in long sweeps once the marsh goes bronze. There is a particular satisfaction in pulling out of a driveway with the stripes still holding and the pavement swept bare.