Quote:
Originally Posted by ronaldhanko
Mine are grown under lights with very little other background light. That would make little difference in any case, since the artificial lighting is on far before and after the beginning and end of daylight. I have tried varying the length of the time the lighting is on (reducing it a certain amount for three or six months and then increasing it by the same amount for either three or six months) and it has made little difference in flowering that I could tell, and has not affected flower color at all (though I understand that is not necessarily a matter of light intensity, but the amount of light).
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Well the only reasonable explanation I have, Is that in Seatle and other "due north" places, differences in temperature are enough to trigger this kind of effect absent on the tropics.