Re: Musa velutina hardiness.
I planted a small velutina last summer and it came back for me this year. I have it in a raised bed, covered with an inch or so of mulch. Don't give up on your illustris, mine just popped out this week. I also have some ice cream bananas that are just now starting to come up. Give everything a little more time, I think thing are waiting on the HOT weather.