Start at the lake in Weequahic Park, where the water holds the whole sky, then walk any direction into the South Ward: block after block of houses with a strip of green out front and a real yard behind. Johnson Lawn Legends LLC keeps that grass cut, edged and trimmed, week after week, from the first warm Saturday in April to the last leaf in November. Newark grass grows fast in June — thunder, then heat, then two inches overnight. The pleasure of the job is the line, that sharp border where lawn stops and sidewalk begins, drawn fresh every visit. Come autumn the mower gives way to the rake, and the yards go into the cold squared away.