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Northern Nebraska | Seed sunflowers have heliotropism. The heads follow the warmth not the light. They do this because pollinators prefer the warm side of a flower according to research out of uc Davis. What you described in your last paragraph is phototropism. Reletives of sunflower have this such as compass plant. Its leaves grow in orientation to light. It never occurred to me that sunflower head could have both photo and heliotropism.
I've never heard the bit about allowing greater photosynthesis however. Where did you find that one out?
Edited by Hilltop Husker 8/8/2020 09:33
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Sunflowers and traveling with the sun.
