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It is a terribly invasive plant that out-competes many native species. It's also hard to eradicate. It establishes a "seed bank" very quickly, will re-grow if cut down, will re-root if pulled up but left on the ground; and if all else fails produces cleistogamous flowers (they self-fertilise in the bud stage).
If you have the right to do so, uproot and hang over a broach or fence to dry out. Be diligent in the first few seasons to prevent it establishing itself.
Yes, I had learned about how invasive it is :-), so keep an eye out for it. It had popped up along the canal increasingly this year, but I was surprised to see it in the woods.
Lat/Lng: 53.06866, -2.10598
OS grid ref: SJ929523