That stinking weed is one of the few things I enjoy killing. I'm against Roundup as much as the next guy, but.........................try spot killing it with Roundup. It turns brown in 2 hours. After four days you will be hard pressed to find whats left of it. The key is spot kill. Don't soak an acre with that stuff.
Roundup works good for shallow rooted weeds and grass but for deep rooted grass like Bermuda grass or Cat Claw vines it doesn't totally do the job.
I think, in order to please the customers, it does as you say. It knocks down the exposed parts of the plant fast, giving them the impression that they succeeded in getting rid of the plant. The problem is, because the upper part of the plant dies quickly, the deep roots don't get any of the Roundup down to them so they live on to grow another day.
I've found that the Ace (brand) "Weed & Grass Killer" kills slowly and completely.
When you've sprayed the weeds, the next couple of days they look all perky and happy. Six to seven days later, they are beginning to droop. Another three or four days later, they are totally wilted and down to the ground. It might take two weeks to kill the plant but when it's thru, that plant is totally and I mean totally dead. While this was happening, the Killer was slowly working its way down thru the roots and killing them slowly but thoroughly.
That makes it effective even against the Cat Claw vines I mentioned.
For those who aren't familiar with these invasive plants, the roots form bulbs on them every foot or so along the lengths of their runners. Once they are established the only way to get rid of them it to totally dig them out or, use something like Ace Weed & Grass Killer.
This Ace, Weed & Grass Killer doesn't have anything on the label that says it is poisonous. It does say to keep it out of the reach of children and it can irritate the eyes. It is safe to allow kids and pets into treated areas after it has dried. It also isn't good for fish so there are warnings about using it where runoff can be a issue.
