Where did the fall colors go?

I was outside this a couple weekends ago raking leaves and found that the Ginko leaves in my front yard were all green. Turns out I am not alone. The reason that many leaves in southern Minnesota fell off trees before they turned color was because of cold overnight temperatures.

"Leaves generally go from green to yellow, or red, or brown in fall as a result of both shortening days and cooling temperatures," said Jerry Cohen, a professor of environmental horticulture here at the University of Minnesota.

Read the full length article in the Star Tribune.

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