Mow the lawn like you normally would using the 1/3rd rule (Never remove more than 1/3rd of the grass blade when cutting). If you regularly cut the lawn at 2.5 inches, mow the grass before it reaches 4 inches high. Do not mow the lawn when the ground is too wet and be sure to mow with a sharp mower blade. A dull blade rips and shreds the grass instead of cutting it, seedlings can actually be torn from the soil. Mowing with a dull blade also makes the plants susceptible to other problems such as additional stress on the turf, brown leaf tips and potential disease infestation.