I'm not entirely sure what plant you are speaking of, Karen, but, if you want to go the herbicide route, I suspect one containing glyphosate will do the trick. Otherwise, try horticultural vinegar. Either way, make sure you do not get the material on adjacent plants or you are likely to kill them, too.
thank you very much douglas. I will try one-if that doesn't work i'll try the other.
I just found this plant last year, it is doing very well in a large pot and seems to take wherever I put it... Just that in South Texas it needs shade.... I find it very pretty going from green to purple......Sorry it's a problem for you.....
these WILD POTATO PLANTS spread everywhere. they take over and its hard to keep up with them. we didn't plant them, we bought a property that hadn't been taken care of in years.