I would be wary of some of even the named cultivars, which can be quite spreading and vigorous, I believe.
True, though if it's the wild one it's a 'don't even go there' but if it's a cultivar, the next question is 'which one?', as you say. For example Emily Mackenzie is very well behaved IME, George Davison rather less so.
Gardening on the edge of Exmoor, in Devon
“It's still magic even if you know how it's done.”
George Davison does increase quite fast. My other yellow, Solfatare I think, (label went awol years ago), is slower and Rowallane I can barely keep alive. Zeal Tan is another that struggles, but Carmin Brilliant and Emberglow are both lovely and well behaved too.
Which leaves Lucifer, which I love, but it needs to be split every couple of years or it flops, and there are no more places where I need that much bright red! Might have to put some by the farm gate, free to a good home!
My lucifer is not doing much, planted this year, only got three flowering stems from five plants. It’s in good, well-amended clay soil, well watered, but maybe it doesn’t like it’s very sunny south-facing spot. Will see how it gets on next year...
Mountainous Northern Catalunya, Spain. Hot summers, cold winters.
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“It's still magic even if you know how it's done.”