I use the professional strength roundup but in the generic brand called killz all which is around $45 for 2.5 gal. The red label roundup concentrate is only 18% of the active ingredient glysophate but the killz all is 41%. They sell the purple label of roundup which is a super concentrate at 50% but for the price you end up paying for the little bottle of it I can spend a little more and get the 2.5 gal of the other. We have rattlesnake weed around here and it is super hard to get rid of because you have to dig the tubers (which look like really fat rattlesnake tails) and those tubers send out runners which keep going and going and going sort of like dollarweed. We were told that if you use the roundup pro on it about 3 times it should get it, you have to spray it whenever you see it trying to pop back up. Weed B Gone has seemed to work also. I've only sprayed that one time in a different area that didn't get roundup and it hasn't popped back up yet, but we'll see. It's very invasive and we have tried digging it up, but some of those tubers go down like 3-4 feet and I can't dig the whole yard like that.
What is the stuff that is made just for violets and woody vines?
