Plant Flowering Signals and Day Length

Plant flowering signals are controlled by biological clocks and changes in day length. The circadian clock is an internal, molecular timekeeping system that helps plants coordinate activities across 24-hour cycles, also called circadian rhythms. Photoperiodism is the set of plant responses to different lengths of light and d...

The flowering of most plants is synchronized with seasonal changes, allowing plants to germinate during optimal conditions. How do plants sense time and seasonal changes? 

Internal timekeepers called biological clocks sense environmental variations, such as changing light levels. Biological clocks allow plants to regularly follow circadi...