This is old iron country — ledge close to the surface, oak on the ridges, and a September light that comes in hard and clear off the hills. Black Diamond landscaping cuts lawns in that light, week after week: mowing, string trimming along walls and outcrops, edges reopened where the turf creeps over the blacktop. Autumn brings the cleanups, the leaves off before the first hard freeze pins them down. Mount Arlington yards run small, steep and stony, and the trick is making them read as one sweep of green anyway. When they do, the whole street looks better for it.