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How high should grass get before cutting? How low should grass be cut?

By David Beaulieu, About.com

Question: How high should grass get before cutting? How low should grass be cut?
Answer: How high you should allow the grass on lawns to reach before cutting it is perhaps the most widely encountered FAQ in any Lawns FAQ. And "How much of the grass blade should be removed when you're cutting grass?" is a natural sequel to that question.

An optimal height for cutting a cool season grass in summer is about 2 1/2 inches. And at each mowing, you should only be removing about the top 1/3 of the grass blade. Consequently, a good time to mow lawns is when your grass is about 3 2/3 inches high. However, warm season grasses may generally be cut shorter. Please consult cool season grasses vs. warm season grasses.

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