"Bob Hobden" replied to
"stevej" who asked
I have a Cordyline, I think it is an Australis and it's just a nice size
and shape. Can either potting it or clipping the roots slow it down
without harming it ?

Steve, the roots are busy making their way home so your chance of pruning
them or successfully digging up the plant to pot it are rather small.
They look better as they get older and bigger IMO, especially once they
have split into a nice head and flower each year.

"stevej" wrote
I should have been clearer, its's in a large decorative pot now. But will
outgrow it soon, my though was to lift it and place in a normal plant pot
and then put it in the decorative pot and cover with compost.

Doe's that change your view, my alternative is to put it in the ground,
whereby I quite agree, let it grow. Assuming we see some sun.

It will just buy you time then. It will eventually outgrow the new pot too
and probably will look unhappy in the process.
If you have space plant it in the ground and it will turn into a nice
specimen tree in a few years.

--
Regards
Bob Hobden
17mls W. of London.UK