How many hours of light is required for long and short day lighting?

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  • The amount of lighting varies by plant type. However, a general rule would be more than 12 hours of darkness for short-day plants, less than 12 hours of darkness for long-day.
while the above answer may work as a rule of thumb it is far from accurate. the term long-day or short-day is not a specific number of hours even if you are looking at the same plant variety or even the same plant itself. the term is relative. a shift to longer nights (resulting in shorter days) which happens in winter will signal to a short-day plant to bloom and the other way round for long-day plants. note i pointed out the lengthing or shortning of the dark period relative to the light period as the signal. zaf.
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Why do hours of day light change?

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How many hours of day light does North Pole receive June 21?

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How long is 13 light hours?

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How many km is in a light hour?

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