By mid-July the fields at Medway Community Farm on Winthrop Street have gone the color of a paper bag along their edges, and every lawn in town is asking the same question about heat and water. Fasolino Irrigation answers it on the grass side — mowing at a height that helps turf hold up, trimming and edging so the lines stay sharp, cleanups in spring and again when the leaves come down. A Medway lawn that stays even and green through an August week is not luck; it is somebody watching it closely all summer. The reward is walking a property on a Friday evening and finding it uniformly, quietly right. That work runs across Medway and out into the towns next door.