Hi.
I have no outdoors, but I manage indoors. Were I you, but must be your call, I would knock it out and remove all the bad roots and cut the rhizome back to where it is sound, and frow the rest...and the existing media.... in the gar-bhage.
I would also dust the cut margins with cinnamon or fungicide or flowers of sulphur.
I would also let it just sit in low light for a day or so outside any medium so that the edges can begin to heal.
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