GlendaG's Full Review: Roundup Concentrate Weed and Grass Killer: Roundup...
Be very careful when using this product because it's so effective it will kill just about anything it touches. Any plantlife, that is, except for trees, and I'm not so sure about those.
A couple of years ago, I accidentally sprayed a very few drops on the trunk of a rather large 25-year-old pyracantha bush. I immediately hosed it off, thinking I could minimize the damage. Nope, it was dead within days.
I've started off with this little anecdote to make sure you're aware that my 5-star rating of Roundup comes with a warning. Actually, it's because Roundup is a such an effective product that you have to be careful with it.
So what do I use Roundup for exactly? What I regularly use it for is to destroy weeds that love to grow along a chainlink fence where they're safe from John Deere. It takes about a week for the weeds to turn completely brown. Unless they're tall or thick, you don't even have to remove them. This is quite a bit easier than using a weed eater on both sides of the fence.
The other way I used Roundup was to clear an area of weeds so that I could plant spring flowers. (This was where I got into trouble with the pyracantha.) Fortunately, the weeds died even quicker than the pyracantha although it was admittedly a high price to pay.
I was concerned that the Roundup on the weeds might damage or kill the flowers I was planting where the weeds had been. I waited a week after spraying with Roundup, cleared out the weeds, and planted the flowers. The flowers were fine, with no damage.
Epinions.com periodically updates pricing and product information from third-party sources, so some information may be slightly out-of-date. You should confirm all information before relying on it.