Root pruning roses

[Borderstotheleftofme]

To fit in smaller than ideal pots, will it work long term?

I have some gorgeous Arthur bell roses in small pots (maybe 30cm odd deep and probably about the same in circumference)

They were in the ground originally.
I put them in the pots after they got bad black spot in the ground.

I dug them up, cut them down, put them in the pots and I’ve been really careful to ‘baby’ them, eg lots of compost, used tea/coffee grounds, careful checking of moisture levels etc.

They are looking fantastic
No black spot, lush, healthy green leaves, lots of flowers

I’d like to keep them in the pots permanently as being raised and right by my door it’s much easier for me to look after them but this rose variety has a mature size of 60 - 90cm...

I was thinking I could possibly lift them every winter and root prune to fit?
Bit like a bonsai?

Cut of the long tap root and then root prune every two years. They should be fine.

Thank you!

I meant to say do it in late February.