Living · 6 pages · 12 min
Some plants flower when the night is long enough or short enough, which a lamp in the dark can undo.
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Some plants time flowering by the length of the uninterrupted night, which is the other face of day length. A pigment in the leaves measures that dark, and the measurement decides whether a bud turns toward a flower. The opening covers night length is the measured part, a light break resets the pigment, and short-day and long-day are opposites.
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