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Zones (Re: Sweetcorn Spacing)

Square Foot Gardening List - http://www.flinet.com/~gallus/sqft.html

Nancy F. wrote:
> 
>     May I please have some help understanding the various zones, as in
> Olin's sig line?
> 
> >>>>USDA Zone 9, AHS Zone 12, Sunset Zone 13<<<<

USDA zones are based on how cold your winters get:

                  Fahrenheit       Centigrade/Celsius
     zone 1        below -50°F          below -46°C
     zone 2     -50°F to -40°F       -46°C to -40°C
     zone 3     -40°F to -30°F       -40°C to -34°C
     zone 4     -30°F to -20°F       -34°C to -29°C
     zone 5     -20°F to -10°F       -29°C to -23°C
     zone 6     -10°F to   0°F       -23°C to -18°C
     zone 7       0°F to  10°F       -18°C to -12°C
     zone 8      10°F to  20°F       -12°C to  -7°C
     zone 9      20°F to  30°F        -7°C to  -1°C
     zone 10        above 30°F           above -1°C

Those of us who live in the tropics have claimed our own zone:

     zone 11     no frost ever

Sunset zones were developed by Sunset Magazine and are popular on the
west coast of the US.  This system is far more sophisticated than the
USDA system, as it takes into account many aspects of climate, not just
cold.  Someone else will have to post details.

I've never heard of the AHS system.
-- 
@->-`-,----------------------------------------------+
|  Cousin Ricky      USDA zone 11, Virgin Islands    |
|  rcallwo@uvi.edu   formerly zone 6, Massachusetts  |
+----------------------------------------------------+


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