How to kill Perennial Bull Thistle growing in groundcover?

How about relocating the pachysandra temporarily, kill the thistle, and replace the pachysandra next spring?

I just use the kind that is ready to use, but I don't use it very much so it lasts me forever. I have both the regular kind and the kind that doesn't kill grass. Take it one area at a time, not all at once, and you will have it done in no time. Doing it one section at a time will make it easier to do it right and yet not stress or tire you out too bad. Just do a quarter to a third one day, another quarter to a third one day, and so forth. Put the round up only on a fresh cut, that way you will be assured it will penetrate as far as possible as quickly as possible. Get help and it will go faster. Get someone to cut it for you. I in general use the roundup for the weeds in the lawn that is safe for the lawns, but if you paint it on the stump, you could use whatever you want. You can do this, you can beat the thistle!