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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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13y ago

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Related Questions

How long does Roundup take to work on killing weeds?

Roundup typically takes around 1 to 2 weeks to fully kill weeds after application.


How long does it take for Roundup to work before rain?

Roundup typically needs about 30 minutes to 4 hours to dry on the plants before rain.


Does Roundup require sunlight to effectively work?

No, Roundup does not require sunlight to effectively work.


How long does Roundup take to work before rain affects its effectiveness?

Roundup typically takes about 30 minutes to 4 hours to be rainfast, meaning it won't be washed away by rain.


How long does it take for Roundup to work effectively?

Roundup typically takes about 2 to 4 days to start showing visible effects on weeds, but it may take up to 2 weeks for complete control.


How long should you wait before pulling weeds after spraying Roundup?

You should wait at least 24 hours before pulling weeds after spraying Roundup to allow the herbicide to fully work and be absorbed by the plants.


How long before the next rain will the weather forecast in the roundup predict?

The weather forecast in the roundup will predict how long it will be before the next rain.


How does Roundup ready seed work?

To oversimplify it, a gene is inserted into the plant that keeps the plant from metabolizing glyphosate (roundup).


What temperature does it need to be for Roundup to work?

well, roundup has a freezing point of -100 degrees Fahrenheit so anything above that should work just fine


Does Roundup work effectively if it rains?

Roundup may be less effective if it rains shortly after application, as the rain can wash away the herbicide before it has a chance to work. It is generally recommended to apply Roundup on a dry day with no rain in the forecast for at least 24 hours.


How long after applying Roundup can you water your plants?

You should wait at least 24 hours after applying Roundup before watering your plants.


How long after spraying Roundup can I water my plants?

You should wait at least 24 hours after spraying Roundup before watering your plants.