I try to keep in under control but it comes up even through the mulch if I don't put down a heavy barrier first. I have been trying a grass killer that kills the roots too. I have been told that you can kill certain plants without harming surorunding plants by putting weedkiller in a hypodermic syringe and injecting directed into the plant but I haven't tried it. It may work better this way if you use a more concentrated dose since the runners can be pretty long. I may try it this weekend as I have a small amount of it in my center bed.
