yes.
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Yes, poinsettias are considered short-day plants, meaning they require long periods of uninterrupted darkness to induce flowering. This darkness prompts the plant to initiate its colorful bracts.
Plants requiring long nights to flower are called short-day plants. These plants use the length of darkness as a cue to initiate flowering. Examples include poinsettias, chrysanthemums, and strawberries.
Long day plants: lettuce, spinach Short day plants: chrysanthemums, poinsettias Day-neutral plants: tomatoes, corn
No, spinach is a long day plant. It requires more than 12-14 hours of daylight to grow and thrive.
due to the light emitted from the car does not triggers the stimuli in short day plant, thus making them seedless.
Poinsettias require specific conditions to flower, such as shorter days and longer nights to induce blooming. The constant light from passing vehicle headlights along the highway likely disrupted their natural light cycle, inhibiting flower production.