By August the Route 23 corridor runs hot and dusty, and lawns from Rockaway up into Kinnelon go quiet under the sun. Pacific Lawn Sprinklers of Rockaway, NJ works those weeks the way they need to be worked — mowing high so the blades shade their own roots, trimming without scalping, edging where turf meets concrete. Kinnelon sits on rocky Highlands ground, thin in places, and every yard has a dry corner that wants its own attention. When the heat finally breaks in September the mowing tightens up and the cleanups begin. A lawn that comes through August intact is worth every bit of the care it took.