A bit rough around the edges

I've not been far today so it's back to the garden again for a blip.  This is growing in one of the pots which I hadn't planted up this year; indeed, I don't remember planting this anyway so it could well have self-seeded.  The pots are stored behind a small fence out of sight but I walk past them when I need to go to the garage, so this is always a cheery and unexpected little bloom that appears as I walk around the fence.   It does look a bit as though something else has been enjoying it too.