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  1. It all depends on whether you're growing a cool-season grass or a warm-season grass and how fast your grass grows. A good rule of thumb is to keep the height between 2 1/2 to 4 inches for cool-season grasses; and about 2 inches for warm-season grasses. Be sure to cut the grass no more than one-third of the total height in one mowing. Ultimately you want to mow high and mow often, and always with sharp blades. This will result in a lawn that is more resistant to weeds, disease, drought, and summer heat--and always looks nice.

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