I had 2 of thes pop up in a space at the front of my border. I don't think I planted them but I've potted them pending an ID now or when flowering. Any help much appreciated.
Thank you @Woodgreen and @nutcutlet, I think it is Figwort. I never would have come up with that. This site is great for ID help. Thanks all who looked.
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Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
BROWN IS A COLOUR Piet Oudolf
In the sticks near Peterborough