I don't think it's marsh marigold,
not one of mine Fishy, I haven't got any.
that weed could be Canadian Fleabane, Erigeron canadensis
aconitum is possible. A photo would confirm.
If you don't want it dig it up and put it in the compost bin. It's poisonous if you eat it. It doesn't search you out and attack. There are many poisonous plants in gardens.
where are you and how warm is it outside. These plants will be very soft and wouldn't cope with being put outside and left there.
horminum, that's the word I couldn't remember
have a look at Salvia viridis. comes in pink or white as well
i think the one you call a palm tree is a house plant. Might be called Dracaena or something like that.
It won't survive a winter outdoors in the UK