By May the ocean starts sending its damp air north across Nassau County, and Westbury's sandy ground drinks it down and asks for more. McCutchan Landscaping & Irrigation Inc. works with that appetite — mowing at heights that shade the roots, feeding the turf, overseeding the thin patches so a lawn can carry itself through August. Trimming and edging hold the shape; bed work and mulch hold the moisture where it belongs. Late in the year the color stays longer than the calendar suggests it should. That is the whole aim here: grass that behaves like it belongs on this island.