Long-day plants are plants that need over 12 hours of sunlight before they can flower. Lettuce is a type of long-day plant because it only flowers when the days are longer, during temperate summers.
Long-day Plant
Laura Murphy
Long-day plants are plants that need over 12 hours of sunlight before they can flower. Lettuce is a type of long-day plant because it only flowers when the days are longer, during temperate summers.
AP Biology 
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