its your garden YA so if you want one grow it. It is well known for suckering though and the RHS recommend a sheltered warm spot against a wall. link below.

https://www.rhs.org.uk/Plants/21715/Romneya-coulteri/Details

As you say they are beautiful plants.

I think the problem is they suggest you grow it against a wall so people grow it against a house wall when the plant get cold it searches for warmer place which is under the house or even better inside the house through the brick cavity. I may try it around my shed.

A friend of mine planted it beside the house wall and found it coming up in his living room a few years later!

Oh dear. Like YA I liked it so much I bought one but kept it in the pot once I did some research on it. It died so not for me. Mind you I am hopeless with house plants so maybe this is one I might succeed with lol.

They are complex to own if you leave it in a pot until you can decide where to plant it they seem to die. I too had one before and left it in a pot and it died I was kind of glad at the time. But here we go again if you have desire you cannot help yourself . I'm at a new place which has more opportunities and won't upset neibours if it spreads.