(Charlie Neibergall/Associated Press)-in this photo Tuesday, January 24, 2012, Manager Jerry Brian Holub — see the seed package on the screen can Earl nursery and Garden Center in Des Moines, Iowa. The USDA announced Wednesday, January 25, 2012 new map plant hardiness zone, a key to determining the plant can survive in parts of the country. The official guide government colorful planting zone is being updated for warmer the 21st century.
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A new guide, launched Wednesday at the National Arboretum, also uses weather data better and offer more interactive technology. For the first time it takes to factors such as how cities are hotter than the suburbs and the countryside, near a large body of water, wind, and the slope of the land.