On Tue, Dec 12, 2017 at 3:34 PM, Peter Borst wrote:

> > Interesting thought,  but what then triggers the actual sap run?
>
> “Frosty nights and warm sun make the maple sap run” is an old Ontario
> pioneer saying.


Same applies for nectar flow at the Valdivian Temperate Rain Forest ... The
land of the Ulmo !

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