Re-pot Arum 'Crowborough'?

It should be fine to re-pot it now, just as long as you keep the bulk of the rootball together though if it is pot bound, this shouldn't be a problem. In short, yes is the answer :-)

Personally I'd wait for the foliage to die down. Just like any bulb it needs feeding from the leaves!

Back to square one!
Thanks, guys. LoL
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If it's any help, I have re-potted Arum italicum before it died down and it was fine. The roots are typical monocot roots and are thick and fairly robust so should move easily.