Please note: ONLY leaves are to be placed in collection piles; NO GRASS CLIPPINGS will be collected. Damp grass clippings clog the machine and can damage the impeller. Please place your leaves as close to the curb as possible and refrain from placing piles near utility poles, mailboxes, railings, cars, etc. It is difficult to maneuver the machine around these obstacles, and not all leaves may be picked up.