How Do Trees Know When It's Spring? A Horticulturalist Explains The Science Behind Seas... - 0 views
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William Ferriter on 18 Apr 15It's a warm, sunny day in April, and all the trees are in bloom. But how did they know it was warm and sunny? And on a warm, sunny day in February, what keeps them from blooming? Scott Aker, a horticulturalist at the U.S. National Arboretum, tells Robinson Meyer how the process works and what to look for.