Bluegrass, perennial ryegrass and fescue may be mowed as low as 1 1/2 inches and as high as 3 inches, making sure no more than one-third of the grass blade is cut off each time you mow. It is recommended to mow at the higher setting during the warmer months and at the lower setting in the spring to stimulate new sheath (lower portion of the grass blade) growth and in the fall to help prevent disease from settling in over winter.
Learn more about mowing in our basics section.