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  #1  
Old 12-05-2008, 09:45 PM
portboy portboy is offline
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Default How long does 'Round-Up' take to work

Put Round Up on a whole lot of weeds in the back garden yesterday...anyone know how long it takes to work...doesn't actually say on the box ?
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  #2  
Old 12-05-2008, 10:44 PM
kbie kbie is offline
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Default Re: How long does 'Round-Up' take to work

Could take 10-14 days. The principle is that the roots are killed off first and then the leaves die because the roots are dead.

Don't worry, it will happen but you must have patience!!
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Old 13-05-2008, 10:21 AM
BOXtheFOX BOXtheFOX is offline
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Default Re: How long does 'Round-Up' take to work

Having said that, I used Roundup many many years ago and it worked fantastic. The last time I purchased it I found that it didn't work as well. I thought that the manufacturers might have watered it down a bit?
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Old 13-05-2008, 10:58 AM
serotoninsid serotoninsid is offline
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Default Re: How long does 'Round-Up' take to work

I used it in the depths of winter when there was zero growth (its only recommended for use during active growth) and eventually it worked 100%. It just took a long time.
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Old 17-05-2008, 12:43 PM
croman croman is offline
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Default Re: How long does 'Round-Up' take to work

I have used Round-Up twice during growing season and found it worse than useless.
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  #6  
Old 17-05-2008, 12:47 PM
mercman mercman is offline
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Default Re: How long does 'Round-Up' take to work

It is pointless using Round Up when it is raining. It needs 3 or 4 four days to sette and get working. After that it will work, but be very careful - the fumes from it are Toxic.
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  #7  
Old 12-02-2011, 12:48 PM
olafshiel olafshiel is offline
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There seems to be a bit of misinformation here. Roundup will work in the winter, it just takes longer. On a summers day it will start to kill weeds within 2-3 hours, with visible signs in within 4-5 days it takes 6 or more hours in the winter. If it rains it will be much less effective. Roundup fumes are not toxic, it's a herbicide not a pesticide so try not to drench yourself in it or drink it. If you use a mix of 1 litre of roundup for every 40 litres of water it will be devastating.
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Old 16-02-2011, 10:14 PM
sblandscapin sblandscapin is offline
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depending on whether it roundup pro biactive or the pre mixed squirter bottles, and weather i.e rain about 3-5 days
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