re: Mowing economics: How many times a year do you think you mow your lawn per year?

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I'll bite. What's the 1/3 rule?

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Many turfgrass professionals recommend the one-third rule, which states: Never remove more than one-third of the leaf blade height in a single mowing. Although widely known as a “rule,” it is more of a general guideline. The benefit of this rule lies more in regular mowing than it does in measuring and removing exactly one-third of turfgrass height. Regular mowing at the appropriate height can prevent scalping and reduce weed encroachment. In Louisiana, follow the recommended mowing heights (see table) per turfgrass species to promote a healthy, vigorous turfgrass.

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