You may want to try to divide them. If it is growing out of the top, it may need a bigger home. You can wait til spring if you don't think you have enough warm temperatures left in the season to help it adjust.
You can divide it into more of the same size pots or smaller ones. The roots can take it especially if it is pot bound and a mass of roots. I just use a small saw and cut mine up into pieces that will fit into the chosen pot. I loosen the root ball from the bottom a bit and bury it in new soil. OR, if you want you can transplant it as it is into a larger pot. Chances are, it came in a 12" hanging pot, it might be harder to find a larger one. Or, at least I had my problems finding them. I am settling for doubling my fern population next spring. into 12" hanging pots. Give it a fair amount of root stimulating solution or Miracle Grow and you and your fern(s) will be happy again. btw. It's been a month and my greenhouse fern has finally adjusted. I saw no more leaf drop this week.
