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And that shade is key to conserving moisture in the soil, which in turn helps keep lawns green and healthy. Mowing a bit higher during the warmer months also helps keep weed seeds from finding a home in bare soil.
As winter approaches, the advantages to taller turf begin to diminish. Instead of conserving moisture, the tall blades become a hiding place for pests looking to overwinter. But even more, that tall cover of turf never allows the grass to dry out completely. Especially in the damp, cool conditions that autumn provides. And that dampness is a haven for mold and turf fungus to develop.
So what is the ideal height to mow your lawn before winter? Some were even suggesting a July feeding for cool-season lawns, which is death on a stick to the poor grass.
The states that provided the best basic lawn care advice mostly advocated not changing the height. Specifically, I think you should wiggle your cutting height down all year long, not just in the Fall. You say that you're cutting at four inches, but a three -inch cut is ideal for like fescue and Kentucky green. Having three inches of green allows the lawn to maximize its photosynthesis.
Cut it lower than that and the grass begins to use up more nutrients to grow faster and regain that missing height—all at the expense of the underground root growth that keeps weeds at bay.
And three inches is the perfect height for shading the soil surface from hot summer sun. No, because a three-inch cut is good at staying upright. Once it gets too tall, the grass begins to bend over, mat down and shade itself, which invites disease to move in, especially in a wet season. Or in your late-season case, when a heavy snow cover sits on the too-tall grass, and you get one of the two diseases collectively known as 'snow mold'. Lawns need good airflow, just like other plants.
And if you're following the one-third rule, your 'four inch grass' is actually around five and a half inches tall by the time you cut it. The "one third rule" is lawn care Never remove more than one-third of the total height in any one cutting. People refer to this as the one-third rule. You might look forward to nice deep snow fall but your grass does not. If you cut the grass incorrectly you could set your lawn up for snow mold and allowing little critters to stay in the lawn for warmth..
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