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• USDA Hardiness Zone Map And Pennsylvania Planting Zones

• What Growing Zone Is Pennsylvania - GFL Outdoors

• Pennsylvania Interactive USDA Plant Hardiness Zone Map

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• USDA Hardiness Zone Map For Pennsylvania - The Garden Magazine

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• What Hardiness Zone Is Philadelphia? - Ask PHS

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• PA Hardiness Zones - Erie - Gerlach's Power Equipment

• Pennsylvania-vegetable-planting-calendar - Pinterest

• USDA Hardiness Zone Map And Pennsylvania Planting Zones