![]() Our fact check work is supported in part by a grant from Facebook. ![]() Find videos for pop culture, concert series and. Thank you for supporting our journalism. You can subscribe to our print edition, ad-free app or electronic newspaper replica here. Watch the latest TODAY video with anchors Hoda Kotb, Savannah Guthrie, Jenna Bush Hager, Al Roker and more. UC-Davis College of Biological Sciences News, Aug.5, 2016, Circadian regulation of sunflower heliotropism, floral orientation, and pollinator visits 4, 2016, Young sunflowers follow the sun's rays Stacey Harmer, May 18, phone interview with USA TODAY.In the absence of sunlight or moving sources of light, sunflowers grow straight upwards, rather than turning toward each other. Sunflowers are regulated by circadian rhythms that orient them toward sunlight. We rate the claim that sunflowers face each other to "share their energy" in cloudy weather FALSE, based on our research. So there's no way for a flower to change position and face another flower once it is open," she said. "By the time the flowerhead is ready to open, the stem has stopped elongating, and that means that the plant can't bend anymore, because it's not growing. The photo in the meme showing two flowers facing each other is also misleading, she says, because mature flowers, which face eastward when grown in sunlight, do not bend at all. Instead, they grow straight upwards, against the force of gravity. In sustained cloudy weather, sunflowers will eventually "forget" those learned rhythms, Harmer says. Unless the weather is overcast for several days in a row, sunflowers will continue their normal movement patterns.įact check: Sinkhole caused a Missouri lake to drain - again By putting sunflowers under light sources that do not move, Harmer and her team found the pattern holds for around 48 hours.
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