In a moment of lockdown desperation, I chucked seeds from last year's annuals in some empty pots in case I couldn't get anything else.
My lockdown lottery has resulted in some petunias with tiny flowers (I'm guessing their parents last year were a petunia/calibrachoa hybrid) in this pot and these mystery plants.
My head is telling me one thing but at first they looked like something I planted in other pots so my heart is hoping that is what it is and, like the petunias, the bees have mixed things up a bit. The first/lower leaves are a different shape to the upper leaves (second pic).
Anyone want to dash my hopes and confirm my suspicions?