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Here's How to Use the USDA's Plant Hardiness Zone Map
Interestingly, the first edition of the plant hardiness zone map was created by Arnold Arboretum at Harvard in 1927! And ...
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New USDA ‘plant hardiness’ zoning map may help determine life or death of your perennials
The U.S. Department of Agriculture published a new version of its well-known Plant Hardiness Zone ... Arizona spans across zones 5 through 10. The new map, created by USDA's Agricultural Research ...