High Falls Gorge roars all summer just outside Wilmington, and August in the valley is warm days, cold water, and grass that will not quit. Rowe's Contracting LLC mows through it, trimming around ledge, posts and plantings and edging paths and drives to a firm border. Rain comes over the ridge in a hurry here, so the route bends around the weather more than it would anywhere flatter. Yard cleanups in spring and again in autumn deal with everything the mountain drops. Sharp-edged and even, a lawn down here holds its own against a lot of rock and river.