> 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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