Sligo Creek runs its long green seam through Silver Spring, and the yards that shoulder up to it grow fast in a Maryland June. Green Yard Landscaping and Masonry LLC keeps those lawns in hand — the mowing lines drawn straight across a slope, the trimmer taking the shaggy collar off a fence post, the edge along the walk cut back to a clean gray line. Humidity here makes grass ambitious; a week of it and a yard forgets its shape entirely. There is real satisfaction in giving that shape back, in the smell of cut grass rising off a Long Branch side street while the cicadas start up in the poplars. Come autumn the same yards go gold and the work turns to hauling the leaves off before the rain glues them down.