Planting an Earth Day garden? Consider climate’s ‘new normal’

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Among the most important factors determining which plants will thrive in a given location is how cold the winter is. Some plants and trees can’t tolerate sub-freezing temperatures, for example, while some require a chilling period of a minimum legnth in order to break winter dormancy and flower. If you’re planting a garden this Earth Day, this set of maps can help you see how planting zones where you live may have shifted over the past few decades in response to warming climate.

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