Re-pot it next Spring. When the new growth has emerged, you can remove the dead fronds. I like to work on ferns from March to May, whether they're in containers or in the ground. I've attached a link to my Thread on a re-potting I did this Spring. I cover potting mix, root- trimming, and container-size. Let me know if you have any questions. Josh |
Here is a link that might be useful: Giant Chainfern - Spring 2009 re-pot (pics)