Will my banana (Ensete ventricosum) survive a western Oregon winter?
Your False Banana would not be cold hardy.
Here is a couple of articles.
https://www.gardeningknowhow.com/edible/fruits/banana/growing-cold-hardy-bananas.htm
https://www.gardeningknowhow.com/edible/herbs/ensete/ensete-false-banana-plants.htm