Stand on the Great River Bridge in July and the Westfield River goes by green and unhurried; stand there in January and it runs black between white banks. Great Valley Landscaping works both of those towns — the summer one, mowing and edging and mulching lawns across the city, and the winter one, plowing driveways and clearing walkways before the first cars move. Snow here can arrive as a fine dry powder off the hills or as heavy wet inches that bend the hemlocks, and each kind gets handled differently. Spring cleanup is the pivot: rake out the sand and the winter litter, and the grass comes back fast in this valley. The reward is small and specific — a black driveway at dawn, a lawn with its lines laid straight in June.