Spring shows up on Long Island in a hurry — one warm week in April and everything from the Nissequogue's headwaters to the neighborhood grids of Nesconset is growing at once. Designs By Longo inc. meets that rush with mowing, trimming, edging and the seasonal cleanups that lift a yard out of winter and back into shape. Properties around here range from tight village lots to deeper parcels backed by oak, and each wants its own cutting height and its own timing. What ties them together is the finish: crisp borders, swept walks, a lawn that reads as deliberate from the curb. Nesconset and the hamlets of Smithtown around it, kept up on a steady rotation.