Spring vegetables are usually planted in autumn, probably after September. It will mature in spring after planting, and it will be planted at the end of 10 at the latest. Generally, spring vegetables are planted by sowing seeds. Common producing areas are Hebei, Shandong, Hunan, Zhejiang, Gansu, Jiangxi and other regions. Generally, it matures in March every year.

The vernal equinox is the fourth solar term in spring. On this day, the sun shines directly on the equator, and the northern and southern hemispheres are equally divided day and night. After that, the direct point of the sun will continue to move northward, with long days and short nights in all parts of the northern hemisphere, and the weather will become warmer and warmer.

Many festivals and solar terms in China are related to eating, and the vernal equinox is no exception. On the vernal equinox, many places have the custom of eating "spring vegetables", which used to be a kind of wild amaranth. However, the spring equinox season is full of spring. In addition to wild amaranth, many seasonal vegetables in spring are also veritable "spring vegetables".

There are 10 kinds of seasonal "spring vegetables" in spring, including asparagus, chrysanthemum, lettuce, spinach, Toona sinensis bud, shepherd's purse, leek, garlic moss, peas and celery.

Toona sinensis varieties:

There are many varieties of Toona sinensis, which can be basically divided into purple Toona sinensis and green Toona sinensis according to the different colors of Toona sinensis buds and cotyledons.

Purple Toona sinensis includes black Toona sinensis, red Toona sinensis, red Toona sinensis in Jiaozuo and Toona sinensis in Ximouzi.

Green Toona sinensis includes green Toona sinensis and pholiota adiposa.

Different varieties of Toona sinensis have different characteristics. The crown of Toona sinensis is generally open, the bark is grayish brown, the spores are purplish brown, the first buds are purplish red, shiny and fragrant, with less fiber and more oil; Toona sinensis, erect crown, blue or greenish brown bark, slightly fragrant and less oily.