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Here's How to Use the USDA's Plant Hardiness Zone Map
Each zone is divided into half zones designated as 'a' and 'b'." The purpose of the zones ... are both in the USDA hardiness zone 9a because the map is a measure of the coldest temperature a plant can ...
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Understanding the updated Plant Hardiness Zone Map and how it can improve your garden
The United States Department of Agriculture (USDA) has released a new Plant Hardiness Zone ... temperature ranging from Zone 1 (coldest) to Zone 13 (warmest). Each zone is divided into half zones ...