Swackett Fun Fact: What Triggers Leaves to Fall?

Swackett Fun Fact:  The veins that carry fluids into and out of the leaf gradually close off as a layer of cells forms at the base of each leaf.  These clogged veins trap sugars in the leaf and promote production of anthocyanins.  Once this separation layer is complete and the connecting tissue are sealed off, the leaf is ready to fall.
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