There are shortday longday and dayneutral plants

Plants that flower in response to photoperiodic stimuli fall into several classes. Poinsettias, chrysanthemums, and 'Maryland Mammoth' tobacco are short-day plants (SDPs), which flower only when the day is shorter than a critical maximum.

'Maryland Mammoth' tobacco flowers only when days are shorter than 14 hours, its critical day length.

Henbane flowers only when days are longer than 14 hours, its critical day length.

14 hours Light I Dark

14 hours Light I Dark

'Maryland Mammoth' tobacco (short-day plant)
Maryland Mammoth
Light

14 hours

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Essentials of Human Physiology

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