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  • From: Pat Meadows <pat AT meadows.pair.com>
  • To: Market Farming <market-farming AT lists.ibiblio.org>
  • Subject: Re: [Market-farming] Perennials
  • Date: Wed, 16 Jul 2003 15:32:19 -0400

On Wed, 16 Jul 2003 12:54:50 -0500, you wrote:

>Pat.
>
>Zone 5 takes in a massive area of varying environments including soil
>conditions, low and high temperatures, snow cover, and humidity.

Sure does. I think more than the other zones.

>How is it all zone5? Top and bottom level temps for particular dates, on
>the average?

No, it doesn't appear to be based on that. If I read the
paragraph below correctly, it's ONLY based on the average
minimum cold temperature expected in winter.

The quotation below is from the US National Arboretum.

----------------------------------------------
From:

http://www.usna.usda.gov/Hardzone/

This map supersedes U.S. Department of Agriculture
Miscellaneous Publication 814, "Plant Hardiness Zone Map,"
which was revised in 1965. This 1990 version shows in
detail the lowest temperatures that can be expected each
year in the United States, Canada, and Mexico. These
temperatures are referred to as "average annual minimum
temperatures" and are based on the lowest temperatures
recorded for each of the years 1974 to 1986 in the United
States and Canada and 1971 to 1984 in Mexico. The map shows
10 different zones, each of which represents an area of
winter hardiness for the plants of agriculture and our
natural landscape. It also introduces zone 11 to represent
areas that have average annual minimum temperatures above 40
F (4.4 C) and that are therefore essentially frost free.
---------------------------------------------------

Pat




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