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Glyphosate (the active ingredient in the product with the trade name of "Roundup") normally has to have enough time to translocate (move around) in the plant in order to begin inhibiting photosynthesis. This will typically be around two to three weeks for the plant to visually appear dead. However, plant growth and development is essentially halted within just a day or two for susceptible weed species. Remember, glyphosate does not kill all weeds, just most of them.

Remember to always read, understand, and follow all label instructions on any pesticide before attempting to use it. If in doubt, please contact a qualified applicator, county agent, or state department of agriculture.

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Q: How long for roundup to work?
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