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With more maintenance, St. Augustine can provide a very desirable lawn with a thick, dark green, lush turf capable of crowding out weeds. The mowing height for St. Augustine is 2.5 to 4 inches. Shady lawns should be mowed at 3â to 4â. Generally, the lower you mow it, the more frequently you will have to mow, but the result will be a higher quality turf. St. Augustine grass should NOT be scalped in the spring like other warm season grasses.
Mowing heights may range from 1 to 3 inches depending on the frequency of mowing and the degree of shade present. At mowing heights below two inches, St. Augustine grass should be mowed every five days during late spring and summer. At a 2 1/2 inch mowing height, a 7-10 mowing schedule is adequate. Above 2 1/2 inches, St. Augustine grass should be mowed at 10 to 14 day intervals. In moderate to dense shade, St. Augustine grass should be mowed at about 3 inches at 10 day intervals. During the fall, mowing height should be raised about 1 inch to increase total leaf area of the turf. The increased leaf area will help the grass accumulate energy reserves to get through the winter.