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US National Arboretum

 
 

US National Arboretum
The new 2012 USDA Plant Hardiness Zone Map
illustrated below is located here

2012 version of USDA Plant Hardiness Zone Map
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Last Updated   January 24, 2012 10:50 PM
URL = http://www.usna.usda.gov/Hardzone/index.html

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