By July the water at Mohegan Lake holds its heat well past sundown, and the lawns along the shore roads get their last cut of the day in gold light. Diaz Landscaping Corp mows those yards, runs a crisp edge along the walks, and trims the awkward slope by the seawall where no machine wants to go. Cleanups bookend the year — beds opened up in April, leaves and stalks carried off in November. Then the lake turns slate-colored, and the same trucks come back with plows on the front to clear drives and shovel out steps and doorways. Same properties, same care, only the season changes what the work looks like.