By two o'clock in July the air over the Zena flats goes still, and the hayfield edges shimmer at the far end of a lawn. Carmody Lawn Services works straight through that heat — mowing, string trimming, edging drives and walks, raking off what the cut leaves behind. The seasonal cleanups bookend the year, opening a yard in April and closing it down in November. Shutting off the mower at the end of a hot round and seeing the whole lawn lie level and striped is worth every degree of it.