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Sunflowers are not always facing toward the sun, do you know the reason?

a month ago

Sunflower is a well-known plant, it is a large annual herb. It is versatile. The plant grows quickly, and it is easy to cultivate so it has grown all over the world. The seeds of sunflowers have an extremely high percentage of oil content and are fragrant and delicious. They can be fried or pressed for oil. They are important oil crops. Its receptacles, stems and husks can be used as industrial raw materials...

Sunflowers are divided into two categories: "ornamental" and "edible". Generally, ornamental varieties have smaller plants and can be planted in pots; edible varieties are taller and are mostly planted in the open air. Whether or not a sunflower faces the sun depends on what stage of growth the sunflower is in. It is inaccurate to say that sunflowers "always face the sun".

The sunflower is indeed facing the sun during the period from germination to before the flower blooms. Its leaves and flower follow the sun from east to west during the day, but not immediately. Botanists have measured that the direction of the flower is about 12 degrees behind the sun. , which is 48 minutes. After the sunset, the sunflower’s face slowly swings back, and at about 3:00 in the morning, it faces east again and waits for the sun to rise. However, once the flower is in full bloom, it will no longer turn towards the sun, but will be fixed towards the east.

Sunflower pollen is afraid of high temperatures. If the temperature is higher than 30 degrees Celsius, it will be burned. Therefore, it is fixed to the east to avoid direct sunlight at noon and reduce the amount of radiation. However, exposure to the sun early in the morning helps dry the dew that collects at night, reducing the likelihood of mold attack, and on cold mornings, the sun's rays warm the sunflower trays small nests that attract insects to stay there to aid in pollination.

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