China has a vast territory, rich resources and abundant product resources. However, even so, China still needs to introduce some species from abroad. After all, these species do not exist in China. When introducing exotic species, most people are hostile to them, because although these exotic species have high value, they have almost no natural enemies in China, and they often have a certain impact on our local ecosystem. The more famous ones are Spartina alterniflora, hyacinthus orientalis, Bullfrog and crayfish introduced species, which once had a serious impact on the local ecosystem in China. Due to the eating habits of our country, although some exotic species caused serious consequences in the early stage, most people are eating them now, so that they can only be artificially planted or eaten, artificially propagated, crayfish and bullfrog. They are still rampant in many foreign countries and have become agricultural products in China.

In addition, China has a unique food culture, which is rare in foreign countries. It is like eating wild vegetables. Many wild vegetables that no one wants abroad have become the treasures of our country, one of which is called "sunflower potatoes". Friends in the north may not have heard of sunflower potatoes, but friends in the south, especially those in Guangxi, Guangdong and Yunnan, must have heard of sunflower potatoes, which are not native plants in China, but in South America and India. It was first introduced from India to Guangxi, Guangdong, Guizhou, Chongqing, Sichuan, Yunnan, Hubei, Hunan and other places. After planting land, it fled to the wild. It mainly grows in ravines, rocks on river banks, walls next to villages, wasteland or bushes in rural areas in southern China.

Because its fruit is similar to the traditional Chinese medicine Panax notoginseng, it is also called "Teng Sanqi" among the people. Of course, although its name is Panax notoginseng, it does not have the function of Panax notoginseng. Don't use it as Panax notoginseng. Although it is a wild plant in India, it is not visible in India, because it is a twining vine with strong fertility, and its roots, bulbs and broken branches can reproduce asexually. The vines grow very fast, they can grow to 1 m a week and 3-6 m in the growing season. The whole house is careless. India is not used to eating wild vegetables, and the sunflower potatoes are often submerged, not only in India, but also in most foreign countries. The sunflower potatoes have become the main "harmful weeds" abroad, although they are not popular abroad.

Why is it a high-calcium vegetable? Because it is a kind of wild vegetable, it has a high nutritional value, which is higher than spinach. According to relevant records, it is rich in nutrients such as protein, carbohydrates, vitamins, carotene, calcium, iron, zinc, etc., especially carotene and calcium, so it is called "high-calcium vegetable". It is not only nutritious, but also delicious, and its tender leaves and fruits can be quite good. In southern China, there are stewed chicken with sunflower seeds, cold salad sunflower seeds and other dietary methods. Due to the advantages of the above-mentioned sunflower seeds, many farmers in southern China have begun to plant sunflower seeds in large quantities. It is understood that sunflower seeds can be plucked in almost four seasons, and if planted properly, the annual output can reach 75,000 kg/ha, which is higher than most vegetables.