Black Berry vines
I recently moved to Vancouver Island from Alberta and I'm having a small problem that is growing into a bigger one. I've been madly pulling up black berry vines as they pop up but it seems like 2 or 3 take the place of the one I pulled out. It's incredible how invasive and persistent the plants are. Besides Roundup which I've used once already, is there anything that will get rid of these from my garden, or at least significantly slow them down? I've used Roundup once so far and then mulched to a depth of 3" everywhere but they are winning anyway. Help!