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[GWL]: climate zones


To my knowledge there is no equivalent of the USDA (United States Department 
of Agriculture) climate zone map in Europe, although I once saw the American 
zones on a European map.  The reason the USDA map doesn't always apply 
accurately to England is because it is a cold tolerance map and has nothing 
to do with heat tolerance (or lack thereof).  That is why the American 
Horticultural society worked to create the Heat Zone map which records the 
warm extremes of North American climates and rates plants for their 
tolerance.  When determining the hardiness of a plant in North America, the 
USDA climate zones should be used in conjunction with the AHS heat zone 
ratings.
    Catriona Tudor Erler

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