Mystery Solved: How Plants Know When to Flower

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Mystery Solved: How Plants Know When to Flower
By Robert Roy Britt,
LiveScience Senior Writer
11 August 2005

Scientists have known since the 1930s that plants sense the length of the days and, somehow, use that information to decide when to flower.

Russian scientists back then speculated that a mysterious substance must be transported from leaves to shoot tips, stimulating the formation of flower buds. They called the mystery chemical "florigen."

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