Mowing your lawn may seem like a straightforward task, but the WAY you mow makes a big difference to your lawn’s overall health. Here are a few things to keep in mind as you mow: Don’t mow too short! Most growth happens in the top 2 inches of a blade of grass because that’s where photosynthesis (converting of sunlight to energy for growth) takes place. If you scalp your lawn, you take off all the growing parts. New growth then has to come from the crown, which robs energy from the roots.