> The Buckeye appeared to be more regulated by photoperiod than by
> temperature.

Randy you are right on the button.  Some plants require a set amount of 
chilling time.  I guess we could refer to these as cold units.  Once they 
have achieved this they will break dormancy and bloom within a "set" number 
of days with daily temperatures have little to do with bloom initiation. 
Plants that exhibit this in my area have a very strong tolerance to frost 
damage in the bloom.  They are usually early bloomers like:  Silver Buffalo 
Berry, Forsythia, Lilac, and spring blooming mustards.  The past three years 
in this area have seen an early spring, a normal spring, and a very late 
spring.  Bloom dates on the above mentioned species varied by only a few 
days while other species had variations of almost three weeks.
Dave
South East Idaho 

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