Des Higgins wrote:
They self seed. Do not let it set seed.

I'll have a word with it then.

The native oakwoods of SW Ireland are being strangled by it.

I know. Sad affair. I don't like rhodo. I really don't. There was a
chap garden designer who's name escape me now, who did extraordinary
things with the rhodos he had. He managed them in such a way, the
trunks were beautifully shaped, elegant and I had never thought the
trunks could be so colourful, the leaves bushed out in clouds like in a
japenese landscape. Really nice.