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Whether Maps?(TEMPERATURE GAUGE: Notes from a warming world)(climate zone map)(Brief article)

For many people, planting a garden is a rite of spring, and for many gardeners, the US Department of Agriculture's color-coded climate zone map is a handy way of knowing which plants will thrive where. But with global warming causing noticeable changes in weather patterns, the USDA's map, last published in 1990, is out of date, causing some green thumbs to grumble.

As temperatures rise, the hardiness zones for many plants is shifting northward. The Southern magnolia, for example, was once limited to a zone from Virginia to Florida, but can now grow well ...

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