>> 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.


Somehow  my point didn't come across!  My bad.   

What we don't actually know is what triggers that sap run,  sure  we think
we do,  but why does the sap run in maples when oaks are fast asleep?  Or
piack any number of other plants still dormant.  There is huge variation,
not based on anything particulary obvious.  If it was temp  trees in some
areas would never be dormant or shed leaves,  if it was strictly daylight
hours seems we would also see other responses.   


Charles

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