I would just chop the leaves when they get burnt and let it go to it's semi-dormant state for winter unless you build a GH around them. Keep in mind that once the temps go below 57 the nana stops growing. I think your fighting a loosing battle. Maybe you should pot em up and just bring them in when it's cold. My opinion.
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One thing I read that I have been pondering is someone said they use the large C-9 size Christmas tree light strings and wrap the trunks before covering the tree in a cold snap. I do not know if that would burn the leaves or not without seeing an actual picture but it would produce some sort of heat source.
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Buzz. You're in Z5. The leaves are a lost cause, chop em. Cut the stem at 18" (or however much you wanna save) Build a cage around it, fill it with leaves, and then cover with DOUBLE plastic. It's that easy. Basjoo's are VERY HARDY.
