Tall single stem plant identification

in Plants
We moved into our new house late September and are finally getting to work in the garden. I've just noticed this plant and would like help identifying it. It's about 1.2m high, with a single stem (and a few smaller stems coming up from the bottom) with a bud on the top. It's been supported with a cane bt the previous owners. Any ideas? Apologies for the pics being the wrong way round!
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might be a tree paeony. If so shouldn't need staking, maybe came with the plant when bought.
In the sticks near Peterborough
I thought tree peony too Nut
. If so, you are in for a treat - they are gorgeous 

Thank you. I did think maybe but the bud doesn't look as rounded as the pictures I can see on google?
Lovely plants. Might be what you say aym but looks like any number of them at this time of year, yellow, white, red, pink, single,double.
In the sticks near Peterborough
tree paeonies are deciduous and not early to leaf, they had yellow leaves in autumn but they dropped off as expected. They aren't the most elegant plants when naked but worth waiting for.
There are more tree paeonies than ludlowii. short suckering ones, long gangly ones, spreading ones. But all deciduous
In the sticks near Peterborough
I agree, a tree peony. I have 4 different ones and the buds on one of those look very much like the photos. Hopefully, the new stems from the base will help it bush out a bit in the future. Be careful when weeding around it as it is all too easy to accidentally knock the buds off at this time of the year.