Worldwide Plant Hardiness Zone Maps (was: Re: Arctic Express)

Lee Poulsen
Thu, 18 Jan 2007 11:55:20 PST
Because of the recent intense cold in a region of the U.S. that doesn't 
experience it very often at all (and curiously, of all my plants that I 
didn't protect the first cold morning, the younger leaves of Clivias 
fully exposed to the 3°K clear night sky appear to be the only thing 
that got damaged), and because of people's enthusiasm over Jay's new 
thumbnail capability for the wiki, I thought I'd mention now that I've 
uploaded my collection of the best USDA Hardiness Zone maps that I've 
found so far for various regions around the world to the Miscellaneous 
section of the wiki (in the Hardiness Zone Maps subsection). I'm still 
in the process of adding explanatory text, so wait for that before 
asking me any questions. Some of the maps are JPEGs and some are PDFs 
(which usually contain a lot more detail). All are supposed to use the 
same (USDA) methodology for determining the zones, but I think some 
were more accurate at doing this than others. Also, it appears that 
some had more detailed temperature data than others had (and/or better 
mapping algorithms). But all in all, it's a first cut at being able to 
compare similar climate zones (or at least winter-time expected cold 
temperatures) among many of the various countries and continents that 
we all live in, or from which the plants we want to grow originate.…

--Lee Poulsen
Pasadena, California, USDA Zone 10a

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