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BIA Forestry and Wildland Fire Management · 1,217 like this
October 1 at 1:15pm · - What gives fall its color? For the foresters in the audience - this will take you back to your dendrology class...
"...in the fall, because of changes in the length of daylight and changes in temperature, the leaves stop their food-making process. The chlorophyll breaks down, the green color disappears, and the yellow to orange colors become visible and give the leaves part of their fall splendor."
http://www.esf.edu/pubprog/brochure/leaves/leaves.htm