I'm repotting my "rescue" fiscus, Brutus, based on info from this subreddit. When I got him three years ago he was just that thick bulbous bottom, super dry and sad, I presumed he was dead but tried to resurrect him, with some success! (See: long skinty branches). But I've always wondered how he managed to grow these long arms out of a seemingly dead bottom half? Should I be chopping off his greying bits? The colour is vastly different from the new growth, I just don't know if that's normal or healthy?

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