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Sunflowers Track the Sun, Like Solar Panels; Then Turn Toward the East at Night for Next Sunrise

Growing sunflowers begin the day with their heads facing east, swing west as they follow the sun through the day, and turn back to the east at night. “The plant anticipates the timing and the direction of dawn, and to me that looks like a reason to have a connection between the clock and the growth pathway,” says Stacey Harmer, a plant biologist at UC Davis.