I wouldn’t break the original plug off. I don’t like chopping a hole in the middle of the colony and it will do some damage. I usually just snip off an end piece and place it on a new plug.Fragging question as I've not attempted it yet - since I got an actual doser awhile back my encrusters have been spreading like crazy and I'd like to share. How would I frag this rainbow Monti? You can see the outline of the original plug underneath - can I just cut that off or would it be better to give it a blank plug to grow onto?