I don't know its limits, but I. korolkowii is much more cold-tolerant than
the oncos. I think that this is one reason it has contributed so much to
the more widespread gardenability of our modern arilbreds.
In a message dated 5/9/2009 11:38:46 P.M. Mountain Daylight Time,
Oh, wow! That looka amazing! And very unlikely to grow in zone 3.