Short-day plants flower when nights are long, like chrysanthemums, and long-day plants flower when nights are short, like radish. The phytochrome pigment senses the light period, and then florigen, the flowering hormone, is sent to the shoot tips.
But when I read this in my notes, all I can think of is our old letterpress. It only works properly in the cool, dim morning light—the humid afternoon sun swells the paper and ruins the impression. So these plants and my press, we both have our own strict *timing*, isn't it?
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