bigdog

I have had the same problem with Raja Puri, so I suspected it might be the problem. Lucky guess, really! I don't leave mine out for the winter like you did though, because even with protection like you had, it would be useless in my climate. I can save Musa basjoo and M. sikkimensis pseudostems with protection, but that's about it. M. cheesmani did that to me this last winter. When uncovered, the pseudostem looked firm and healthy, but the center leaf had rotted to the corm. I haven't tried protection like that with M. yunnanensis yet though, because I just thought that the pseudostems were too thin to bother with. Seeing as how cold-hardy it is turning out to be though, I may give it a shot this next winter!

Anyway, the Raja Puri that rotted out on me was just stored under the house for the winter. I don't think it did it to me this year though, but I'm not sure yet. I managed to save one green leaf, so I'm hesitant to cut the pseudostem down yet to check the center leaf. After years of doing this though, if there aren't any leaves to save I usually cut down until I find green in the middle. I don't have any experience with leaving Raja Puri in the ground over the winter, but I know of some in zone 8a that do and it comes back for them. So while the pseudostem may not hold up well to cold weather, the corm does fairly.