Can anyone identify this plant? Sprouted at the back of the border over 6ft tall and growing!!! Looks verbena like with square stems but are smooth.
edited June 2019
Pics pretty blurred but I'll have a go. Could be
Scrophularia auriculata (
Any running water at the back of your border?
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Central Norfolk UK
Certainly one of the figworts ... my bet is Scrophularia nodosa, the Common Figwort, as the stem looks wrong for the Water Figwort.
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Winnie the Pooh