Have I been growing a weed for several months? Pic.

in Plants
At the time I potted this up, I must have been convinced that I knew what it was. Several months later I have no idea. Some sort of 'cuckoo plant' that has taken over the pot maybe? It lives outdoors. Just fetched it in to take photos. It seems to be quite healthy apart from a couple of singed leaves.

I'm hoping it is something more interesting than a weed. Looks a bit like a Beech.

I'm hoping it is something more interesting than a weed. Looks a bit like a Beech.
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It's not gardenworthy but excellent for wildlife, maybe plant it on some waste ground somewhere that is lacking in trees.
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
@B3 It would probably make an excellent get-up for guerilla gardening.. except in the US where one would most likely end up shot, mistaken for big foot or some other nonsense.