Ah, photoperiodism is plant's response to day length for flowering, and vernalisation is chilling to promote flowering. And yes, "short day plants" are really "long night plants"—it’s the uninterrupted dark period that triggers them. In my lab, we prove this nightly with black cloth tents over the chrysanthemums. But from my stall, I see my daughter’s night-long study lamp in Guwahati—it’s her long nights of work, not short days, that will make her future bloom.
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