By seven in the evening the mowers have gone quiet and the cicadas take over the trees along the back roads toward Bridgehampton. That last hour belongs to Reyes Lawn Care & Landscaping — the trailer loaded, the day's yards behind them, every one of them mowed, trimmed, edged and blown clean. Summer out here is short and demanding; a lawn asks the same thing every single week and gives nothing back for a week missed. Doing it right becomes a habit more than a job, and it shows in August, when the neglected yards start to look their age and the tended ones do not. Southampton, Bridgehampton, Water Mill and Sag Harbor.