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Usda plant hardiness zone map the 2012 usda plant hardiness zone map is the standard by which gardeners and growers can determine which plants are most likely to thrive at a location. the map is based on the average annual minimum winter temperature, divided into 10-degree f zones.. "this is the most sophisticated plant hardiness zone map yet for the united states," said catherine woteki, usda under secretary for research, education and economics. "the increases in accuracy and detail that this map represents will be extremely useful for gardeners and researchers.". Usda plant hardiness zone 1 is the coldest zone designation for the united states. with minimum average temperatures between -60 to -50 degrees f, it can be a difficult zone for gardening. the majority of zone 1 is located in alaska. this tundra environment is extremely harsh and plants must have extreme cold hardiness and drought tolerance..
In 2012, usda released updated plant hardiness zone maps for the united states, each individual state, each geographic region and puerto rico. plant hardiness zones are based on the average annual minimum temperature over a 30-year period, not the lowest temperature the thermometer has ever hit.. Washington, jan. 25, 2012--the u.s. department of agriculture (usda) today released the new version of its plant hardiness zone map (phzm), updating a useful tool for gardeners and researchers for the first time since 1990 with greater accuracy and detail..
The usda planting zone hardiness map the usda planting zone hardiness map provides us with guidelines as to what will, or will not, grow in the area in which we live. the hardiness map has been modified recently with a 5-degree fahrenheit change for both cold and warm climates.. The plant hardiness zone map is a map with designations that represent the average extreme minimum temperatures in your area of the united states..