An April morning below Tinker Swiss Cottage puts frost across the grass along the Kent Creek ravine, and by nine it is gone and the season has begun. Green Diamond Lawncare & Landscaping Co. runs Rockford's mowing calendar from there — even cuts, trimmed fence lines, edges cut clean where turf meets drive and walk. Spring cleanups clear what winter left in the beds; fall cleanups take the leaves down off the slopes before rain mats them into the turf. Yards on this side of town carry grade and shade to work around, which makes each one its own small puzzle. Solved right, a lawn holds its shape the whole summer.