What factors determine when a camellia blooms?

I have two camellias in my yard. One consistently blooms about 2-4weeks
after the other but when they bloom varies wildly from year to year. My
neighbor has one that always blooms 2-4 weeks before either of mine. They
have started blooming as early as late November. They have almost always
started blooming before Christmas. But this year they have not started
blooming yet and it is almost February. All three are similar in size and
all are on the north side of our houses and close to the wall.

As far as I can tell conditions are very consistent. It has not been very
cold this year. Rainfall has been good. There seem to be a large number of
healthy buds so I assume it isn't a nutrition issue.


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"Patriotism is the last refuge of the scoundrel." Samuel Johnson
"Patriotism is your conviction that this country is superior to all other
countries because you were born in it."
George Bernard Shaw

Marc