Cutting height is dependent on the type of grass you are cutting and the climatic conditions in your area. In central Florida we have several types of grass and each looks and lives best under different cutting heights. St. Augustine Floratam and Zoysia do best when cut at 3.75" to 4.00". Bahia has to be cut at 2.5" because it bends under the blade at higher settings and looks like crap. Bermuda grass can be cut at any height, but, if too short it looks brown after mowing.