These seedlings (about 2" high at the moment) have appeared in my wooden tub which has a Kilmarnock willow in it. Other seedlings have appeared this last couple of weeks which I've identified. None were deliberately sown or planted in the tub. It's these ones with the serrated leaves which are intriguing me as I've also found them popping up in other parts of the garden. I keep thinking that the obvious redness of the stems should be giving me a big clue but I'm just not sure. The only thing I have in the garden with slightly similar shaped leaves and a strong dark stem nearby this tub is an aruncus but I have no idea if it would self seed. Anyone know? I haven't had seedlings like these show up before.
I know seedlings are very difficult sometimes to identify until there's some good growth, but does anyone have any clue about these ones? Thank you.