some sort of amaranthus?
Rhus typhina, Stag's Horn Sumach.
might be Guitzotia abyssinica, nyjer, bird seed
Food plant of the Cinnabar Moth larvae.
A wild plant of the UK
I got 3 pods, then the plant died
I think those bright colours are for creators of outdoor rooms (or whatever the 'in' term is), not for serious gardeners. Nothing wrong with it if that's what you like.
worth looking at Decaisnea fargesii.
have you any photos showing the top side of the leaves?
They're very slow for the first few years so be patient
I don't know where the advice re airing cupboard came from. Tree paeonies germinate quicker with no heat. Yes, leave them to it. They are hardy. somewhere out of strong sunshine