Poinsettias bloom because of long nights
Poinsettias bloom in response to winter's short days and long, uninterrupted nights, a natural phenomenon that makes them a holiday favorite.
Poinsettias burst into their festive colors thanks to short days and long, uninterrupted nights. These plants, native to Mexico, need at least 12-14 hours of continuous darkness each night to trigger flowering. Even brief artificial light can disrupt this process, delaying their vibrant display. This light-duration response, called photoperiodism, ensures they bloom during winter.
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