When do you water spinach in winter and spring?

After spring, the average daily temperature is above 3 degrees Celsius, which is more suitable for watering. After turning green, when the spinach heart leaves begin to grow, choose sunny days with less water. After turning green, start watering when the temperature is above 3℃ every day for 5-7 days. When the average temperature of the day is higher than 3℃, it is most suitable for spinach, Chenopodiaceae, biennial herbs and green leafy vegetables. The root is conical, reddish, less white, and the stem is upright and hollow, unbranched or with a few branches. Spinach leaves are halberd-shaped to oval, bright green in color, whole or with several toothed lobes. Spinach varieties are divided into spiny species and spiny species according to the shape of seeds. Spiny species have strong cold tolerance and are suitable for planting in winter; Thornless species have poor cold tolerance and are suitable for planting in spring and autumn. According to ancient books such as Old Tang Shu and Biography of the Western Regions, spinach originated in Nepal (Nepal), Boling (Iran) and other countries, and was introduced to China from Nepal as a tribute during the period of Emperor Taizong. It has a history of 1000 years. Now it is cultivated all over China, and it is of great value in vegetables. It is a green leafy vegetable, which is supplied to the market all the year round. Spinach is sweet and smooth, and contains high nutrients such as protein, vitamins, carotene and iron. The chromium and an insulin-like substance contained in its leaves can keep the blood sugar of human body stable and have a dietotherapy effect. It is recorded in "Materia Medica Seeking Truth" that spinach has the functions of clearing away heat and toxic materials, dredging blood vessels and benefiting the stomach, and can treat headache, dizziness, night blindness, thirst, constipation and hemorrhoids. Spinach is one of the green pigments widely used in cooking. It was once listed as the "king of vegetables" by ancient Arabs.