Posted: 14/02/2014 at 13:47
Denise - mine is in a square terracotta pot 16" x 16" x 16" - as my fig tree is a small one I've filled the bottom third of the pot with chunks of polystyrene packaging. As it gets bigger and needs repotting in a few years' time, I'll remove the polystyrene. It will stay in that pot for ever, no matter how big the top gets - the roots will be pruned if need be.
If you think you've given yours too much root room I'd dig down around it and place some concrete type paving slabs around the sides so that it feels as if it's in a pot.