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Hardiness Zones in the USA
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New plant hardiness map, used by gardeners nationwide, is unveiled
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In The Zone: The USDA Plant Hardiness Map Explained - Here By Design
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The Victory Garden . Grow . Primers & Projects . Plant Hardiness Zones, Continental United States | PBS
Planting Zones: All About USDA Hardiness Zones for Growing Plants
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FAQs • What is my hardiness zone?
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