Hello,
i have a Hajaray since last year in a pot. I overwinter the banana in my basement, dark, 10 C, without water.
The banana is in a not good condition. My other musas i have overwintert in the basement looks better, like ice cream, rajapuri ....
Look at the pics.
I think you can overwinter Hajaray like helens hybrind outside in zone 9b without any problems.
Andreas