One of the simplest solutions to a clean cut lawn is a fresh set of blades. Lawn mower blades wear down with use, just like a razor blade. You can tell when it's time to sharpen yours by looking at the grass blades themselves. Ragged, jagged, and torn grass is a sign the blade needs to be sharpened. Weekes recommends keeping a second set of mower blades in the garage and taking the dull set to a specialist to sharpen so you'll never have to wait to mow.