Mighty 'Montbeliardii' is outside now as too big to be inside. I have a couple of layers of fleece protecting the pseudostem, and it is dragged up under the eaves until too tall for there as well.
Montbeliardii is probably one of the more hardy Ensete ventricosum tribe as these were selected for their upright leaves being less prone to radiation frost. Also the darker the leaves the more tannins, which give better frost tolerance, but also give the plant a more bitter taste, although I don't intend eating mine.
Hiniba has the upright habit, but is mainly green which may have been a halfway house between full cold tolerance but bitter taste of Montbeliardii, and the sweeter less hardy wild Ensete ventricosum.
Steve, let me know when the Hiniba are ready and I'll bid/buy one from you