Down in Berkshire Valley the Rockaway River runs cold under the hemlocks, and the yards along it hold their green deep into July. General Lawn Care LLC keeps that stretch of Jefferson cut and tidy — mowing on a steady week, string trimming close to the stone walls, edging where lawn meets drive. Seasonal cleanups run at both ends of the year, with the leaf load out of the beds before snow can press it flat. Shade, slope and thin Highlands soil all conspire against an easy lawn up here, which is exactly what makes a good one worth the trouble. Grass cut even, walks blown clear, gate latched on the way out.