How sunflowers turn their heads

sunflowers

Sunflowers; Marcel Sigg 2013

I saw a news item¬†over the summer that stayed with me, and now that it’s getting colder here in England, just looking at sunflowers is warming. It turns out sunflowers are able to follow the sun because they grow ‘unevenly.’ During the day one side of the stem grows, and then during the night the other side grows. See the article from University of California Davis:
https://nature.berkeley.edu/news/2016/08/sunflowers-move-clock

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