Iíve been testing the cold tolerance of this little known Nana and here are the results, I left one overwintering in the loft and it survived with the p-stem in tacked and it is now growing again, coldest temp was 0c at pot level and -1c near the roof, -7c outside.
I also left three in my north facing porch and they have also survived with the p-stem in tacked, lowest temp was 0c.
The big surprise was with one that I left in my polytunnel ,the p-stem collapsed but the corm has survived and it is now sending up a pup, the coldest temp was -6.2c!! -7c outside, all the zaifui had 3ft p-stems.
I also left two Basjoo in the poly and they had 4ft p-stems, they havenít fared much better than the zaifui.
Next winter Iím going to try zaifui planted out in my garden with the p-stem protected!
Zaifui with pup.
The two Basjoo.
The poly on a cold winterís day.