Half of Beachwood grows in the shade of pitch pine and scrub oak, which makes a good lawn here a matter of patience more than luck. Blades Of Grass mows, trims and edges through the growing season on the thin sandy ground that runs from Beachwood Boulevard down toward the river. A cut taken at the right height on a June morning holds its color all week; a cut rushed shows by Thursday. Clippings come off the walks, the edges get their line, and the yard is left the way its owner pictured it. It is a plain trade, and there is genuine pride in a plain trade carried out well.