Cut the lawn to about 2 1/2 - 3 inches high. This height reduces evaporation of water, invasion of weeds, increases the depth of root growth and helps the plant produce and store sufficient food reserves for future growth. When mowing the lawn, remove about 1/3 of the blade with each cut. Leave the grass clippings on the lawns after each cutting. This returns nutrients to the soil for subsequent uptake by the grass plant.