
When we stock our bird feeders with sunflower seeds, many birds come and crack open the hard shells to reach the nutritious kernels inside. Humans do the same, though we prefer them already shelled. When you look at the sunflower head, with its center surrounded by petals, you are actually seeing a cluster of flowers surrounding a cluster of seeds. Sunflowers are amazing not only for the nutritious seeds they produce but also for the way they track sunlight.
Phytochromes are pigments within plant cells that sense light and help maintain a plant’s biological clock. This “circadian rhythm” helps a plant determine the passage of 24-hour periods. It can persist for days, even when sunlight isn’t present. The sunflower head moves during the day to track the Sun. On a cloudy day, it may even “see” the Sun using wavelengths outside the visible light spectrum. Because of the circadian rhythm, the sunflower head turns to the east to await the morning sunrise.
It is hard to believe that this incredible design is a product of blind chance. It seems that the sunflower design is not the result of any fortuitous accident. Sunflowers are amazing, with their nutritious seeds and the plant’s relationship to the Sun exemplifying God’s design.
— John N. Clayton © 2026









