Planting Zones
Planting zones in the United States, which are also known as Hardiness Zones, can be thought of as the rate of survival to the plant life in that particular region during cold periods, such as winter. In effect it is the survival rate ability of a plant during the winter months that can fruitfully live on into the next growing season. The zones were first developed by the United States Department of Agriculture, or the USDA. After the USDA developed these zones, they were subsequently adopted elsewhere. They are categorized according to the mean of the lowest temperature recorded each winter, termed the “average annual minimum temperature�.
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