Trimming a lawn is more complicated than taking out the mower once a week. Cutting grass at the right height prevents grass blades from burning in the sun, reduces the chance of disease, and increases the density of the grass. Mowing grass properly also reduces the amount of thatch, returning the grass to the lawn to easily decompose, says the University of Illinois Extension.
Cut the grass to the required length for the grass variety and the season you are cutting. Most grasses, such as bluegrass, ryegrass and fine fescue grass require a shorter cut during the spring, between 2 and 2 1/2 inches, and a longer cut, between 2 1/2 and 3 inches in the summer to prevent against sun scorch says the Ohio State University Extension.
Trim the lawn frequently so that only a third of the grass blade is removed at a time recommends the Clemson University Extension. This creates smaller blades of grass, which decompose quicker than large cuttings.
Edge around sidewalks using a weed eater, turning it on its side so that the blade removes grass completely from the area.
Alter the direction of the mowing ever second mow recommends the Ohio State University Extension. This prevents the grass from leaning over to one side, altering the mowing height.
Cut the lawn so that it is left at 2 inches in height at the beginning of the mowing season in the spring, and at the end of the mowing season in the fall recommends the University of Illinois Extension.