Living · 6 pages · 12 min
Why holiday cacti and poinsettias care about nights
Both set their display when nights are long, and a lamp after dusk can cancel the signal.
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From the opening
Holiday cacti and poinsettias are short-day plants, so they start flowers or colored bracts when the night runs long enough. The display you bring home is that dark requirement already met, usually on a grower's schedule rather than on a holiday's. The opening covers long nights start the display, poinsettia color is bracts, and a lamp can erase the night.
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Inside
- Long nights start the display
- Poinsettia color is bracts
- A lamp can erase the night
- Buds already set are a later stage
- Where the idea stops applying
- A distinction worth keeping
Sources
- Short-day flowering in poinsettia and holiday cactus
- Phytochrome reset by an interrupted night