When the last gray snow melts off the Berwyn parkways, the ground underneath comes back green almost overnight, the old prairie remembering itself beneath a century of brick. ProLawn meets that first rush of growth head-on with mowing, edging, trimming and the spring cleanup that resets a yard for the year. The town is flat as a tabletop, which sounds easy and is not: on ground this level a crooked pass shows from three houses away. So the lines get walked straight and the borders get cut clean. By the third week of the season a regular yard here looks like it was drawn with a ruler.