LONG DAY PLANT -- A plant which requires light for a longer period than it would normally receive from daylight in order to induce flowering; e.g Saintpaulia.
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Long day plant - A plant that flowers only when daily sunlight hours surpass some critical level.
Loppers
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LONG DAY PLANT: a plant that requires a night shorter than its critical dark period, usually 12 hours or less, to develop flowers.
Long day plants, such as Calceolaria, Philodendron, and Tuberous Begonias need 14 to 18 hours of light for flowering.
Other plants are long day plants, which means they require a short period of darkness each day to perform well.
 See also: Plant, Gardening, Light, Day length
  
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