anita

I am not so sure if the freezing will not kill her banana. Namwah is a banana native to Northern Thailand/Laos/Cambodia and over there indeed temperatures drop to 35F during the night. I spend myself the winters over there and I have many Namwahs that grow well. What I noticed about their climate is that when is cold, it's also very dry. Then I was thinking where they get the water. Well during the winter over there, every morning it's a dense fog which leaves droplets of water everywhere.
So I suggest don't water souch during cold, misting water in the morning it's better. I suggest you cut 2 pups just in case you have a strong freeze. Then you have same spare banana.