I was reading the information posted on the website of a local fig tree seller (figtrees.net). It advises slowly working your way up in pot size every year. And then once you reach your largest size, it says the tree should be root pruned every 3-5 years.
While it's dormant, he advises pulling the tree out of its pot, trimming back the roots, then placing it back in the same pot and filling in with new soil. I read this same information on another fig growing site as well, and it advised pruning off 1/4 of the root ball.
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