Re: M. itinerans var. xishuangbannaensis after a few hard frosts
If you want to exlude rootrot, then mix lots of sand and compost into the soil. Also plant your banana on 30 cm. higher groundlevel. They should be just fine in rainy UK.
For M. Itinerans, I've read the leaves remain green to about -2* C. That way the cells don't explode by light freeze. As long as the green leaves or still on my bananas (Sikkimensis and Co.) nothing rots.
Actually, it's the (heavy) freezing that grabs them by the throat. :-)
Once frostbitten, provide them with a roof, so those dead cells can dry out. From what I understand that's not your problem, right? ;-)
Succes
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