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Supertopics:
Not Enough Heat for Growing Food

Hardiness Zones

Subtopics and Documents:
USDA plant hardiness zone map
webUSDA Agrucultural Research Se...2023-11-20
USDA plant hardiness zone map (half zones)
webUSDA Agrucultural Research Se...2023-11-20
USDA Plant Hardiness Zone Map
USDA plant hardiness zone map (large)
webUSDA Agrucultural Research Se...2012-01-01
USDA plant hardiness zone map (fewer divisions)
webUSDA Agrucultural Research Se...2012-01-01
USDA plant hardiness zone map (small)
webUSDA Agrucultural Research Se...2012-01-01
USDA plant hardiness zone map (1990)
web2012-01-01
US hardiness zones for 2006
web2006-12-28
US hardiness zone changes, 1990 to 2006
web2006-12-28