Fieldstone walls run through half the front yards in Bernardsville, laid long before anyone thought about mowing around them. R Moore & Associates Tree Experts works those lawns on long July evenings, cutting to the wall, trimming the seam where turf meets stone, blowing the clippings back off the cap. Big sugar maples stand in the middle of things and the mower goes around them patiently, the same way every week. The season opens with a cleanup and closes with the leaves hauled away. What you want in the end is a lawn that looks grown into its walls rather than fitted around them.