Downtown, the September sun comes in slantwise across Military Park and lights the grass up like somebody flipped a switch. Green Glow Gardens LLC works the lawns and green edges around that part of Newark — mowing, edging along the concrete, trimming bed borders back to a crisp line, clearing debris out of the planting strips thousands of people walk past every day. City grass takes hard use: foot traffic, the hangover of winter salt, heat radiating off pavement well into evening. Keeping it green in those conditions is unhurried, repetitive work — cut, tend, return on schedule. A green square in the middle of brick and asphalt is worth all the trouble it costs.