Some of these are hardy down to zone 4! It would depend on them getting winter dry though..
http://www.theplantgroup.com/2...
I wanted to find the breeder in Japan, I think I found them! They are now in both Japan and Ecuador, from next year only in Ecuador.
http://www.florsaika.com/engli...
http://florsaika.com/?page_id=...
I doubt the mixed seeds would come true but must be worth a try!
