The sunflower is a member of the composite family, the sunflower genus, named for the fact that its flower disc rotates with the sun.Its plants are generally 1-3.5 meters high, up to 9 meters or so, is an annual herb.It has strong adaptability and low requirement for soil, and can grow on all kinds of soil.High temperature and low temperature resistance, more low temperature resistance, the best temperature range between 21-26 .Flowering period is from July to August.It mainly has two functions of edible and ornamental.
Double sunflower is a variety of sunflower, is a composite family, sunflower plants.It originated in North America, after the introduction of China.It is an annual plant, the plant is smaller than the ordinary sunflower, and the flowers are larger and more colorful than the ordinary sunflower.The flowers are double, golden yellow in color, closely hydrangea-shaped, 10-13cm in diameter, and have a large number of flowers.The flowering period is from March to November, and the flowering time is long.It can also be eaten and pressed for oil, but its economic value is not as good as that of ordinary sunflowers.
The planting method is roughly the same as that of ordinary sunflower, and the difference between them is small.The best time for sowing is in summer with sufficient light and rain, and the temperature should be kept at about 20 C.After germination, the seedlings should be trained.At this time, proper water control is needed, but the soil should not be too dry, otherwise the seedlings will wilt.Let there be plenty of light, and let there be no shade.Some thin fertilizer water can be watered to ensure that the seedlings grow healthily.
