Proper installation of mower blades is required, as it can be a bit confusing. The lawn mower blades feature cutting edges at both ends. Thus, it will be widespread for you to install the blades upside down. Well, you can follow specific tips to determine the upside of the blade. The first thing you can look for is the wording ‘Towards Grass’ or ‘This Side Down’ on the blade. As the mower blade has two cutting edges, so you should point back the dull and bend edge towards the mower deck. However, the opposite of the trailing edge is the cutting edge with a sharpened point.