I have recently covered up my 1 m tall (the pseudostem) sikkimensis which I hope will survive the winter outside. I wrapped the stem with some thin fleece, which I wrapped a 2cm thick layer of coconut coir around, which I then wrapped in some rockwool. This was covered with a plastic bag to prevent water from entering. To top everything off, I covered it all in leaves with some chicken wire.
Now my concern is that I overdid the whole winterizing thing and that the plant might rot or catch some fungi. This is the first time I try overwintering a banana outside and I wonder if you guys usually have problems with rot.
Also, I have a quite large moso bamboo (~1.5m) next to it which I'm not sure of how to winterize. I was thinking of covering the whole thing with some plastic and pushing it to the ground as I read that bamboos are sensitive to wind.