They send out runners or suckers. I'm not sure what they're called. Anyway,keep an eye on them as they can travel a good six ft. I have the greeny cream one but got rid of the red and yellow one because it became a bit of a thug.
If you keep an eye on it, you can keep it under control. Keep it pruned and watch out for the runners. It took a few years of neglect for mine to become a thug😊
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There is thug spreading in my garden and i want to remove it. I may keep some in large pot, but want it go from border.