On a June morning in North Hampton the fog comes off the water and lies in the marsh grass until nine, then lifts and leaves everything shining. Lariviere Lawn Maintenance mows and tends lawns between Route 1A at Little Boar's Head and the fields inland along 111, where the salt wind keeps turf short-tempered and the sod tight. The work runs to mowing, trimming, edging, mulch, a spring startup and a fall cleanup on yards that face the Atlantic. A seacoast lawn asks for attention — sand underfoot, wind, salt in the air every day of the year. Getting one to hold its green clear through August, with the beach roses going by the wall, is worth every pass.