Most homeowners mow their lawns way too low, especially in the summer. You may think that if you mow it lower, you will have to mow it less often, but that is simply not the case. Mowing turf lower than the plant desires, will put the plants under stress and will eventually lead to weed infestations, reduced heat and drought stress tolerance and could cause eventual death to some of the plants in your lawn. Unless you plan on putting golf balls or hosting Premier League Football match on your lawn, raise your mower to the highest setting, or close to it (3"-3.5"), and allow your turf to develop a long, healthy root system.