Www Fs Fed UshardinesszonesUSDA Plant Hardiness Zones US Forest Service Form

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THE U-S DEPARTMENT OF AGRICULTURE’S NEW PLANT HARDINESS ZONE MAP SHOWS CHANGES OF FIVE DEGREES FAHRENHEIT WARMER PER HALF ZONE THROUGH MUCH OF THE NATION SINCE NINETEEN NINETY.We see a consistent shift. Especially in the eastern U.S. of about a half zone warmer than in the prior map.WHY THE CHANGE? DOCTOR BRETTING SAYS THERE ARE A NUMBER OF FACTORS.It’s based on more data from more weather recording stations. And they were processed by a special mathematical formula that takes into account features of the landscape, such as mountains, large bodies of water, urban areas, which cause sometimes heat islands. And it was recorded over a longer period, thirty rather than fifteen years.THE MAP ALSO SHOWS WHERE PLANTS WOULD BE EXPOSED TO SEVERE WINTER CONDITIONS AND TEMPERATURES AND IS AN IMPORTANT TOOL FOR GARDENERS, GOVERNMENT AGENCIES AND SCIENTISTS.There are more than eighty million gardeners in the United States and many of them will use this as a reference as will landscape architect