Roundup causes the plant to be unable to uptake water, so it dies of drought.
I spray my driveway 2x a year. I guarantee the grass/weeds it has killed, do not regrow.
What grows, is new seed that is there.
2 qt. in 20 gal will exterminate anything growing, but if a seed germinates the next day, roundup will not stop it.
Spray while the plant is actively growing and @ least 24 hours before a rain.
Do not spray when it is Hot-- *90 --- or cold *40, as the weed will be slow to uptake the Glyphosate.
Occasionally you might encounter a weed that has mutated, and will be roundup resistant, but that is not the norm.
If you have weeds that are waxy like button weed, a Non-Ionic Surfactant added will allow the Glyphosate to translocate into the weed better.
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