Clint_Robbins
Civil Engineer
Reged: 09/19/01
Posts: 8984
Loc: Akron, OH
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1. Is it significantly more effective to cut tall (6" and higher) vegetation before spraying with Round-Up?
2. If tall vegetation is sprayed with Round-Up, how long should be waited before cutting it to be sure that it has enough time to be effective?
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bozodog
Carpal Tunnel
Reged: 12/19/07
Posts: 9938
Loc: SW Michigan
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Well, the instructions are on the label, but longer leaves have more surface area for the systemic chemical to be absorbed. Since it is systemic, a day or two should be long enough to wait. I've seen curling and wilting in a few hours on grass and weeds.
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Governments don’t bear the cost of anything; their citizens do.
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howardgillis
Handyman
Reged: 07/22/07
Posts: 1146
Loc: Fort Mill, S.C.
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I'm trying to get rid of a 70 foot by 30 foot garden. I've used roundup on weeds that were about "knee high". It does kill them, and my mower can barely cut it down. I need to plow it so the dirt can be levelled and let the grass and weeds grow and be maintained.
Based on my usage 6 inch high weeds, etc. should be no problem.
I notice that it takes 3-4 days for me to notice a big difference between thriving and dead.
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