Leo A. Martin
Tue, 23 Aug 2005 16:02:18 PDT
 > The USDA zones are better than nothing, just.
 > I have always wondered why zones were not
 > coordinated with our Zip Codes, such would be
 > far more accurate.

I think the zones were developed long before Zip codes.

Almost all generalist plant catalogs print your USDA zone on your 
address label, which they derive from your Zip code.

Leo Martin
Phoenix Arizona USA

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