Down by Kosciuszko Park the ballfields run right out to the water, and on a June evening the whole South End smells of cut grass and low tide at once. Three Brothers & Sons Landscaping LLC works those neighborhoods — mowing, trimming, edging, fertilizing, seeding, and cleanups in spring and fall — the ordinary weekly rounds that add up to a street looking cared for. In winter the routine changes shape entirely: plowing, shoveling, clearing walks and salting, usually beginning long before sunrise. It suits a crew that likes finishing things all the way. Nobody watches the work, everybody sees the result, and that's the right way around.