August on the seacoast can run three weeks without rain, and Stratham's sandy ground gives up its water in a hurry. Jeff Desrosiers Irrigation Company keeps lawns green through that stretch, with irrigation for the turf alongside mowing, trimming and edging and the cleanups that open and close the season. Water settles the argument in a dry summer: a yard holding deep green while the roadside grass goes tan. From the open fields along Route 33 to the neighborhoods out toward the Exeter line, it is steady work and it shows from the street. Nothing looks better in September than a lawn that never once gave up in the heat.