It reminds me of Acalypha rhomboidea. If it were oregano or thyme, it should have aromatic foliage if you bruise a leaf.

Here is a link that might be useful: Acalypha rhomboidea

i think i see a trough ...

if so ... then you should change out the media ... thereby removing it ...

it doenst make sense.. to 'hope' that it will turn into something you may or may not have planted last year ... you might waste the whole season.. growing weeds ...

media in pots wears out .. rather quickly.. hence the suggestion to start fresh each season ...

ken

You may be correct, apparantly this weed has spread to europe. Looks a lot like this one;

virginia copperleaf

Parietaria I believe.

Here is a link that might be useful: Parietaria

To me this looks like Pellitory of the Wall, Parietaria judaica. A common plant throughout Europe, not an alien. As its name implies it is a plant which likes old masonry. Fast draining.âÂÂ

Here is a link that might be useful: Pellitory of the Wall