During the flowering period, sunflowers can be planted in four seasons, mainly in summer and winter. The flowering period can reach more than two weeks. Sunflowers are usually sown in April, flowering from July to August, and seed maturity from August to September. Sunflower, also known as sunflower, is a plant of the genus sunflower in the composite family. Sunflower is an annual herb with a height of 1 ~ 3 meters. Its stem is upright, strong, round and angular. It is covered with white rough hair and likes to be warm. It is named because its inflorescence rotates with the sun. It is native to North America and cultivated all over the world.
Sunflower appreciation (1)
Sunflower is a head like inflorescence, which grows at the top of the stem, commonly known as the flower disk. Its shape has three types: convex, flat and concave. There are two kinds of flowers on the disk, namely tongue flowers and tubular flowers. Tongue shaped flowers have 1 ~ 3 layers, which are inserted around the edge of the disc and are asexual flowers. Its color and size vary with varieties, including orange, light yellow and purplish red. It can lure insects to collect honey and pollinate.
Sunflower appreciation (2)
In addition to its appearance similar to the sun, sunflowers have bright and generous flowers, which are suitable for ornamental decorations. Their seeds have more economic value. They can not only be used as popular sunflower seeds, but also extract high-grade edible sunflower oil with low cholesterol.
Sunflower appreciation (3)
Sunflower varieties can be divided into "general ornamental" varieties or "edible" varieties. The general ornamental varieties are characterized by short plants, usually no more than half a meter, so they are suitable for potting; Edible varieties have tall plants, which can grow to more than 2 meters in the soil of general open-air nurseries.
Sunflower appreciation (4)
Sunflower grows very rapidly. It usually blooms after planting for about two months. Its flower types include single petal, double petal, single flower and multiple flowers. The flowering period is quite long, up to more than two weeks.
Appreciation of sunflowers (5) sunflowers were introduced into China about the Ming Dynasty. The earliest known documents recording sunflowers are people, kings and elephants of the Ming Dynasty; In the Qunfang spectrum (1621) written by Jin Dynasty, there is no name of "sunflower", but among them: "Zhangju - named Ben Fanju - named Yingyang flower, the stem is more than Zhang long, the stem is as thick as bamboo, the leaves are like hemp, and they are mostly straight. Although there are branches, there is only one flower, which is as big as a dish and a cup, and the single yellow heart is made into a nest like a honeycomb, which becomes purple and black in autumn, so it is very easy to take its son". It shows that sunflowers were planted in China at that time.
Sunflower appreciation (6)
Sunflower has a unique American style, which is why the wild sunflower may come from the prairie, and its image is intertwined with the early history of the United States; American Indians ground sunflowers into flour as a food source. Now there are a series of new pollen free varieties, which eliminates the problem of pollen shedding.
Sunflower appreciation (7)