What season is green?

Green generally refers to spring and summer.

Spring represents warmth and growth. In spring, the qi of yin and yang begins to change, and everything germinates with the rise of yang. Summer is the best season for the vigorous growth of many crops. Adequate light and suitable temperature provide necessary conditions for plants, so green generally refers to spring and summer.

As far as solar terms are concerned, spring in China begins in the beginning of spring (February 2-5) and ends in the long summer (May 5-7). In Europe and America, spring begins at the vernal equinox in China and ends at the summer solstice. In Ireland, February to April is designated as spring. At present, the method of "waiting for average temperature" proposed by modern scholar Zhang Baokun is often used to divide the four seasons in China. Taking the five-day average temperature as the standard, the five-day average temperature after winter passes 10℃ and begins to enter spring. When the temperature is higher than 22℃, it means the end of spring and the beginning of summer.