Crow Creek slips through Brookside under sycamores that have been dropping bark on those lawns for generations. Greenleaf Lawn LLC mows and edges the yards along Peoria and the streets behind it, trimming close to retaining walls, creek banks and the tangle of roots near the water. Fertilization and weed control keep the turf thick enough to crowd out whatever wants in. Leaves and clippings are collected rather than scattered, and every walk is left clean when the crew moves on. Shade, slope and old trees make these lawns particular — which is exactly what makes them worth doing right.