Thank You Lucian.
You referred to 'sterile soil' .... I assume you mean fresh potting medium or do you actually sterilze it ?
My banana plants that are short enough after trimming back the pseudostem will be potted up first and brought up into the house.
Trying for the best jump start I can get in our short growing season.
I can place the pots near a baseboard heat panel to keep the soil warm. I do this for all the other overwintering plants
"It's a jungle in here"
Shirley