Any idea how to kill Wait-a-Minute vine (Smilax)? I'm fighting a loosing battle with the stuff in flower/shrub beds along my chain link fence and in the undeveloped lot next door. If you chop it and pull the vine down 2-5 more sprout. When I can find it's root among the other roots it's as bid as a yam and if you leave a piece of root it comes right back. Stuff seems to like the taste of Roundup. I'd like to kill the vine without taking out the shrubs and flowers. Thanks.