Interestingly, the first edition of the plant hardiness zone map was created by Arnold Arboretum at Harvard in 1927! And believe it or not, the most recent version of the USDA plant hardiness zone ...

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John Fech knows there are a lot of excited gardeners after the USDA release of an updated plant hardiness zone map. Omaha’s move from a 5B classification to 6A opens up the area to the ...

Plant hardiness zones are only a measure of the average extreme minimum temperature, and several other variables are at play ...