By noon in July an Oakland lawn holds the heat like a held breath, and the only shade for a hundred feet is whatever the maples are willing to lend. Royal Lawns of America Inc. keeps those lawns steady through the hard middle of summer — mowing at a height the grass can actually live with, edging along drives and walkways, trimming out the corners, and cleanups when the season turns. The reward arrives at day's end: even stripes running the length of a yard, cool-looking from the porch. Oakland is the base, and the same care goes to lawns in Ramsey, Mahwah and Wyckoff.