How do trees know it's fall?

Mule mule at
Sat Oct 31 16:28:54 EST 1998

I lived in Hawaii for four years, and every fall, the trees would lose their
leaves.  The weather didn't change that much when this happened.  I have
always wondered the same thing about how they know when to lose the leaves,
and why they need to...\

boldt at wrote in message <71bkai$dm8$1 at>...
>how do trees know that it is time to drop the leaves? Is it an internal
>the temperature, or the changing light?
>  Axel

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