Exoten und Garten Forum
Hardy Palm and Subtropical Board
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Re: Climate zones by heating and cooling
Message from Tommy Nashville-Miami
Maybe because of how quickly the spring heats up and stays hot to the west. The Hardiness Zones are only taking those extreme lows into account. I think this map shows why there's a difference between northern 7's and southern 7's. Also, I notice the MS River bulge northward on this one which I've always wondered about.
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