Can you tell us where on the planet this is growing?

Not sure which leaves are which. The walnut-like leaves apparently are a different plant. If you could snip off a full leaf & lay it on a white background for a close-up pic, that would help.

Thanks for the replies, I passed by the place again hoping to take my time and get closer for better pics, but the whole area was cleared, so I suppose we might never find out 😅

Looks like a fast growing annual or perennial and not a woody. To me anyway. Can you please tell us what region you live in? Iceland? Hawaii?