zube

I live on the west coast, zone 8. I've had several Japanese larch for quite a few years and they seem to do just fine here. We do not have the extended hot weather in the summer that Mark spoke of. I believe the zone 8 is more a factor of the lower temperatures here, which are occasionally below freezing in the winter, but usually no worse than that.
Good luck,
zube

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Sorry doesn't put thumbs back on the hand, Marge.
H. Simpson