New Hyde Park keeps time by the Main Line — a train every so often behind the hedges, and between the tracks and Jericho Turnpike a grid of small, orderly front lawns. Squares that size are unforgiving: every uneven pass and shaggy border shows from the sidewalk. Dom's Landscaping, Inc. mows, trims and edges them so they read sharp from the street, corners squared and clippings swept back off the walk. Long Island summers run humid and long, which means the grass barely pauses between May and October. Yards are looked after in New Hyde Park, Garden City Park, Floral Park and Williston Park.