- Roundup Dual Action Weed & Grass Killer Plus 4 Month Preventer Concentrate, 32 fl. oz.

I have used this version of Roundup for the past 3 or 4 years. It quickly kills the weeds that are sprayed. It also really does keep new weeds from sprouting in the sprayed area for about 4 months. This concentrated product is the most economical way to buy Roundup, as 1 bottle will make a little over 5 gallons of spray. It is easy to apply with a garden sprayer and is rainproof shortly after application. Just be sure not to spray anything that you don't want to kill.

Really food product, I used it and by the second day I could see the weeds and unwanted grass dying off, will have to see if this is as advertised on the 4 month period as this is the first time I am using this.

It worked great and killed the weeds. It took a bit longer than stated in the instructions, but it did the job

Works great .. tried others and they didn’t work

This works pretty good. We use it to get rid of unwanted grass/weeds in Arizona. When using on weeds or grass that spread using long stolens/roots you will have to keep re-applying on new growth. Every few weeks until all of the roots underground are dead.

It's really working good killing my grass and weeds I don't want

Roundup is a great weed and grass killer. I have used some version of it for years and plan to continue as long as I am able to work outside. At 81 it makes my life a lot easier. Thanks

Wow ! So far weeds in my gravel driveway have not returned…..fingers crossed that 4 month preventer holds true