Banana trees are nearly impossible to kill down here, especially if planted anywhere near a septic tank. Frost will knock them to the ground and double the amount will appear by summer. I had a friend who bought a banana tree with full intention of planting it in the ground . . . and didn't. His lawn crew murdered the pot over time with their weed trimmers so he removed the busted plastic and wrapped the root ball with landscape fabric and added some (for the time being, again) potting mix and, there it sits, 3-4 years later, except now it's 5 banana trees and has put forth a really large bunch of bananas that were about 4" long. He's since added garden edging to his 'mound' of banana trees to where it almost looks intentional and is indeed, one with his yard now.
The last time I was there, I noticed that he had a papaya tree, in a pot. . . and he informed me it was gifted to him by his father-in-law. I suggested he might ought to move it closer to where he thinks he might plant it. . .some day.