What season is green beans? Green beans are planted in spring and autumn. The ripening time of spring green beans is from June to July, and the ripening time of autumn green beans is from 10 to1February. The sowing date in spring is: from late April to mid-May in Northeast China; Most parts of northwest and north China are in April, and the northern plateau is in early May. East China from late March to early April; Most areas in central China and southwest China are from late February to early March; Yunnan is from late 1 month to early February; South China1February to April of the following year. Sowing in autumn: North China and Northwest China in early July-August; From late July to early August in Central China; East China from late July to early September; Southwest China in early August; Late August to 10 in South China.

How long does it take to cook green beans before they are cooked? Green beans should be cooked at least for 10 minutes. It is believed that the head and tail of green beans contain more toxins, and both ends are often pinched off before cooking. In fact, the toxin of green beans is distributed in the whole pod and bean grain, and the toxin can not be removed only by pinching off the head and tail ends. But as long as the green beans are cooked thoroughly, the toxin will be destroyed. When frying green beans, don't be greedy for crispy taste. Stir-fry them, and stew them for 10 minutes or more. When the green beans change from straight to soft, and the color changes from bright green to dark green, they can be cooked.

Shi jun, Ph.D. in Botany, Institute of Botany, Chinese Academy of Sciences, told the reporter of Life Times that green beans contain natural toxins such as phytohaemagglutinin and saponin, which will stimulate the mucosa of digestive tract, and lectin will also destroy red blood cells and blood coagulation function when it enters the blood. After eating undercooked green beans, it can cause human poisoning reactions within tens of minutes to hours, mainly manifested as nausea, vomiting, diarrhea, dizziness and other symptoms.

Can green beans be eaten with spots? It depends. If green beans are long spots caused by cold injury, they can still be eaten without adverse effects on human body, but their nutritional value and taste will be reduced; However, if the long spots of green beans are caused by deterioration, it is not appropriate to continue eating them, because a large number of harmful bacteria have been bred in them, which may cause discomfort such as abdominal pain, diarrhea and vomiting after eating. The discoloration of green beans is mostly caused by too long storage time or too low storage temperature. If there is no other softening, drying and rot, the discolored green beans can still be eaten. But if there are other deterioration besides discoloration, you can't continue to eat it, otherwise it will affect your health.