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  Re: What are the criteria for "Zones"?
From: "Marge Talt" mtalt at hort.net> on 2002.05.22 at 04:55:50(8845)

The US is so vast with so many different climates that the zone
system was developed using the average low temperature - not exactly
pertinent because our zone 8 covers climates that are extremely
dissimilar...but, it's a start. The American Horticultural Society
has recently developed a heat zone chart along similar lines but for
heat tolerance. It is marginally useful since most plants have not
been rated for it and it does not take into consideration many
climate factors.

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