is it better to mow tall weeds before spraying with weed killer

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should I mow before spraying with weed killer
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2 Answers

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If you decide to mow first, use a grass catcher on the mower or the seeds will spread to a larger area.
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and you can also use double strength vinegar & hot water to kill weeds at root after cutting.
by Master Gardner (152k points)
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If spraying it with a glyphosate product, is better to spray it uncut. This is because the weeds are forced to translocate the herbicide to the root, and you get a better kill. When you see major injury (i.e. chlorosis/necrosis), then mow, and do use a serious bagger on that and incinerate the seed if you can ;)
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