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Darkness period and plant flowering

When I studied botany at university (many moons ago) we were taught that
there are "short-day" and "long-day" plants.  Since that time this has all
been overturned.  Quite recently, there was an article in the newspaper
saying that there was no such thing, and that in fact it was the duration of
the night period only that determines whether a particular plant will flower
or not.  Apparently that is that.

Dr. Momfish