Before six on a Rio Rancho summer morning the streets are still and the sprinklers are the loudest thing on the block. H-A-Y&G LLC likes that hour — the grass cool, the cut clean, the whole yard finished before the heat comes up off the mesa. Between the arroyos and the sandy ground, turf here holds on by being tended: even mowing, close trim along curb and block wall, clippings carried off rather than left in windrows. Weekly is the whole secret. By the time the sun is high, the lawn is cut sharp and nobody had to give up a Saturday for it.