Re: Do you have to protect musa basjoo?
Basjoo plants have been know to survive sub-zero temps and are very cold hardy. But from the description of you plants, I think the plant & roots may still be too young & tender for freezing temps. I suggest bringing them inside in pots or as bare roots just to insure they will make it to next spring.
Of course, you can cut the pstem back, mulch very heavily & cover mulch & all with plastic and hope they will come back next spring.
Just my 2 cents worth ....
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