Aug 4, Gardening ZonesTypes of Zone, What to Plant
In 1960, the original USDA zone map was done to show plant hardiness for planting regions.
In 1990, the gardening zones were revised and the maps are recognized as the best indicator of minimum temperatures available.
For example, to use the gardening zones map, find your area, then match its color-coded pattern to the key showing average annual minimum temperature. The key indicates what hardiness zone you live in.
Keep in mind that the map is a general guide; your particular climate conditions may vary. In 2006, the gardening zones were updated by the National Arbor Day Foundation to reflect the warmer climate experienced in many parts of the country since the last revision.
Gardening zones types
There are eleven gardening zones numbered zone 1 through 11. Each zone is 10
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