In fashion atm. Much circulated on social media. Used by those who don't know (or don't care) about micro-organisms in the soil
I find seeds don't rot away in the weather.
If they are ripe/mature they will dry out and be fine. If they are not ripe, they will not ripen once removed from the plant.
i wouldn't remove, I'd be watching most carefully. Very interesting
they are delphs
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Possibly Geranium nodosum
No harm but pointless as it's just the fruiting body of an underground network of mycelium. They're very short lived and you may not see those again for another year.
Kitchen fork for small pots, garden hand fork for the big pots. If totally packed with roots, sometimes I just whack them with the side of a trowel
They're annuals. I think they arrived here in a bag of compost. Some years ago they suddenly appeared in lots of my pots of seedlings, Never been here previously.