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Botany or Plant Biology

What causes leaves to turn in color the fall?

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December 18, 2014 11:34PM

There are two basic processes involved, and for any given leaf it could be one or the other or some combination of the two.The first is that the chlorophyll pigment (which gives leaves a green color) stops being renewed, so the leaves revert to their "base" color.

The second is that products of decay start to build up in the leaves, and some of these decay products are highly colored.