Originally Posted by BananaLee

I wouldn't say basjoo is hardy down to -3 degrees...that's quite a random and too precise a number. It doesn't take into account if that's with protection or not, the mother plant's survival, or just the corm's or pup's etc. Mine survived below -3 but have died at temps above 0 as well. The ultimate low isn't really the main factor, here: it has to be something else. Maybe spring thawing and freezing, maybe fungal disease, maybe the prep was wrong; I don't know. But ultimate low temps can be ruled out, as they survived much lower temps even in my experience and others near me.