April in Alpharetta arrives as a yellow film on every windshield and dogwood breaking white along the ridges above Big Creek. Lawns here climb and dip with the north Fulton hills, so an even cut takes attention rather than speed. Johnson Landscape Company mows to the contour, trims around beds, mailboxes and the base of each tree, and finishes by clearing walks and drives of the season's shed. What is left is a lawn with defined borders and no stray green on the concrete — the look of a yard somebody thought about. Alpharetta and its neighbors north of the river are served.