If you’re fact-checking “This burns weeds in 1 day! They NEVER grow again,” the claim is misleading.
Some contact herbicides can make weeds wilt or brown within hours or a day, because they damage the plant tissue they touch. But they often do not kill the underground roots or rhizomes, so perennial weeds can grow back.
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Systemic herbicides can provide more thorough control of established perennial weeds because they move through the plant, but they generally take several days to show their full effect.
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Minnesota Crop News
And even after a weed is killed, new weeds can emerge from seeds already in the soil.
Bottom line: “Burns weeds in one day” can describe rapid visible damage, but “they never grow again” is not a reliable guarantee. The weed species, product’s active ingredient, application, and whether the weed is annual or perennial all matter.
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ipm.ucanr.edu
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