October turns Chicago's side streets gold and then drops all of it at once, usually on a Tuesday. Williams Landscaping Inc. spends that stretch mowing what is still growing and clearing what has already fallen, taking leaves off the lawn and out of the parkway, off the walks and away from the gutter line where they would sit and rot. Trimming and edging carry on right through the last cut of the year, so the turf goes into the cold with a defined shape instead of a shaggy one. A lawn put to bed cleanly comes back faster in April. The bags at the curb are the proof of an afternoon well spent.