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  Re: What are the criteria for "Zones"?
From: "Randall M. Story" story at caltech.edu> on 2002.05.22 at 15:03:16(8848)
As people have mentioned, the USDA zone concept is really pretty limited.
For example the foggiest parts of San Francisco, some of the hotter and
drier parts of Southern California as well as Miami Florida are all zone
10!! Yet you certainly can't grow a Coconut Palm in San Francisco (or
anywhere in California that I know of), whereas a Dracula orchid that would
be very happy in coastal California would quickly fry in Florida. And on and

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