Sunflower – Phototropism

Q: Why do my sunflowers not follow the sun? They all seem to face east.

A: Sunflowers follow the sun when they are young. But by the time the flowers start forming, the stem is too stiff to let the flowers swivel through the sky each day.

Check out these explanations:

National Sunflower Assoc

Great videos at
Plants in Motion

sunflower 1

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