Flat Rock Brook cuts down the wooded Palisades slope at the edge of Englewood, and in May the shade under that canopy is a green nobody can imitate. Natural Art Landscaping Inc works with what a shaded yard here actually wants — mowing at the right height, patient trimming around roots and stone, bed edging, cleanups and steady lawn upkeep. Dappled ground is fussier than open ground; it rewards attention and punishes a hurried pass. Done properly, a lawn beneath old trees looks composed rather than merely cut. One property at a time, that is the aim.