By the last weekend in May the flag at Patriots Park stands against a real green, and every lawn in the neighborhood has had its first serious cut. Peckhart Landscaping runs the weeks that follow — mowing on schedule, trimming tight to fence lines and foundations, an edge along the walk that stays exactly where you put it. Downers Grove summers hand out everything at once: heat, storms out of the west, a dry stretch that tests a lawn's patience. Steady visits are what carry turf through all of it, and steady visits are the offer. When the leaves come down, the same route cleans up after them.