It is important to know, you should not cut more than a third of the lawn's current height. Cutting too much stresses the lawn. If your lawn is too tall to mow to the proper height, take off the top third and then finish the job a couple days later.
Different varieties of grass have different optimal heights. In general, longer leaves means they can absorb more sunlight, plus the ground is shaded resulting in retention of moisture. Refer to the chart below to determine the optimal height for your lawn.
How frequently should a lawn be mowed?
During the growing season you
will have to mow once a week. During periods of slower growth, every other week should be adequate.
If your lawn turns brown a day or two after mowing, you are either cutting too much off or your mower's blade is dull. A dull blade tears the lawn instead of cutting. Have the blade sharpened at least once a year. A dull blade weakens your grass and makes it susceptible to disease.