Recommended Mowing Height
Let the Rule of One-third be your guide to maintaining a healthy lawn.
Except for the first mowing of the season, never remove more than one-third of a blade of grass at one time. For example, if your grass is 3 inches tall, never mow more than 1 inch off at once. If you remove more than one-third of a blade at a time, root growth slows and the whole plant is shocked until some of the leaves recover and begin growing again.