Out toward Sapowet the marsh grass turns silver when the wind shifts, and you can stand on the road and watch a whole flat go from green to pewter in one breath. NUNES Lawn & Landscape keeps cultivated grass on the other side of that fence line — mowing, trimming, edging, and the cleanups that mark each end of the season in Tiverton. Coastal lawns grow in bursts and then sulk in the August dry, so the schedule bends to the weather rather than the calendar. A yard cut at the right height in the right week holds its color far longer, and that is the sort of thing worth knowing about a town. Come fall the work is rakes and hauling, clearing the ground so spring has somewhere to start.