The height of the most common sunflower is 2.5-3.5 meters, and the highest can reach 9. 17 meters. According to the scientific literature report of 1567, it has always been thought that the height of a sunflower planted in Padua, Italy, can reach12m.
The same seed, planted at other times and places, such as Madrid, Spain, can reach a height of nearly 8 meters. In the Netherlands and Ontario, Canada, more recently, there were more than 8 meters of plants in the early 20th century.
Sunflower plants consist of five parts: roots, stems, leaves, flowers and seeds.
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Sunflower, named after the tip of its young plant in the early growth stage and the young disc in the middle growth stage, will obviously rotate with the sun. This paper analyzes the reason why sunflowers are sunny from the perspective of biological science: Sunflowers are sunny from germination to full bloom.
Its leaves and disk follow the sun from east to west during the day, but not immediately. Botanists have measured that its disk surface is about 12 degrees behind the sun, which is 48 minutes. After the sun goes down, the sunflower tray slowly swings back, facing east at about 3 am, waiting for the sun to rise.
The habitats of wild sunflowers are mainly grasslands and dry and open areas. They grow along roadsides, fields, desert edges and grasslands. It grows best in sunny, humid or disturbed areas.
Wild sunflower is resistant to high temperature and low temperature, but it is more resistant to low temperature, and the optimum temperature range is between 2 1-26℃. Sunflowers have low requirements on soil, and can grow on all kinds of soil, from fertile soil to arid land, barren land and saline-alkali land. Not only has strong saline-alkali resistance, but also has salt absorption performance. It can thrive in alkaline soil and has strong drought resistance.
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