On the beach blocks the dune fence throws long striped shadows in the late afternoon, and the light comes up off the sand in a way you only get on a barrier island. East Coast Synthetic Turf Resources keeps the lawns along those streets — mowing, trimming, edging, hauling off what the wind drops — then turns to plows and shovels once the cold settles in for good. Salt air is hard on grass, so the work out here is patient and repeated rather than dramatic. When a storm buries the block, drives and walkways come back down to the pavement and get treated. Green in the warm months and bare concrete in the cold ones are the same commitment wearing different clothes.