Fog settles in the Nashua valley at first light and lifts off the grass in sheets, and for about an hour every blade in Leominster is beaded silver. Perla Lawn Care starts once that burns away — mowing at the height the season calls for, trimming what the deck can't take, edging the drive back to a straight line. Cleanups come in April and again when the leaves come down. Some yards get looked at every single day by the people who live in them, and that is reason enough to make the finish right. Leominster, with Lancaster, Sterling, Lunenburg and Fitchburg close at hand.