Identification gratefully appreciated
I like a wildish type of planting and am happy to welcome mysterious n
ewcomers, at least until they have shown how they can fit in. The photo is of a recent arrival which I have never seen before but which I suspect may turn out to be very invasive as there are creeping underground stems. There are no basal leaves just upright flowering stems reaching 4-5 feet in height. The flowers are still to open but look as though they will be yellow.
Help with identification and advice will be gratefully appreciated. Thanks everyone.