For best results using a reel push mower, mow no more than 1/3 of the grass blade, so that the roots stay intact. Increase the amount of overlap while using your push mower if your lawn reaches a height of 4 inches or more. It's better to mow smaller amounts more frequently than it is to let the grass get long. Try not reel mower when the grass is wet. 20.0 "h x 24.0 "h x 42.5 h.