+1

In my case, I do not buy the pre mixed bottles. Get the concentrate.
Purple cap concen. take less to use, takes longer to kill (5-10 days).
Red cap concen. takes more to use, kills in 24(+/-) hours.
What ever you buy, use 1.5 times the amount per gallon of h2o in a
garden sprayer. It kills most everything it touches.
FWIW...red cap stuff may be better. If it aint dead in 2 days, hit it again.

I've had so-so luck with weed-b-gone, double strength, in the back yard.

Only other way is to dig it all up, roots and anything apartof.
Burn em, in a bbq grill if ya gotta. Toss ashes in garbage.

HTH..good luck...notnew....

You might also try a "brush" killer, rather than a "weed" killer. Different stuff, much stronger. It's the only thing that put down our poison ivy infestation.

I have repeatedly dug it up, by hand and of course tossed in trash..well actually the bin of other yard debris. But ti still seems to come back, hence my wanting to try something else. As for CC's question, I think someone said to use Round-Up...but I will try the other suggestions. This season everything plantwise has been crazy with the way the weather has been. Even the vole action has been nuts and I must have some elderly hard of hearing types who do not hear the sonic pulses in my in ground repellers.