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["Alan Haigh" <alandhaigh@gmail.com>]

I doubt it.  I'm on the cold side of Z6 and Santa Rosa often suffers cambium damage here.  I believe it may have more to do with spring fluctuations than winter cold, however.  I've seen the worst damage in the last 3 years when winters have been pretty mild.  Shiro and Methely are much tougher in my nursery and the orchards I manage and bear more consistantly by far.  Unfortunately to most they don't taste as good.  Right now I rate Fortune as the most promising really tastey Jap plum here.  Haven't had any cambium damage on trees right next to damaged Santa Rosas and killed Elephant Hearts.