Bitter weeds in Guannan are annual herbs or slightly semi-shrubby, and the plants have bitter fragrance. The stems are solitary or few, gray-white, slightly woody at the base, hairy at the upper part, with a few short branches, thick papery leaves with gray-white pubescence on them, and usually no or very small false leaves at the base; The upper leaves and bracts are pinnately cleft, the head is oval, the corolla is tubular or goblet-shaped, there are glandular spots outside, the anthers are narrowly linear, the style is nearly as long as or slightly longer than the corolla, and the corolla is purple. The flowering and fruiting period is from April to July.

Sonneratia purpurea belongs to compositae. Chinese folks have had the habit of eating bitter vegetables to clear away heat and detoxify since ancient times, which was listed as famine relief food in the Ming Dynasty. At that time, the eating method was: picking seedling leaves and frying them, soaking them in water to remove bitterness, washing them with water, and adjusting food with oil and salt. In addition to edible value, purple bitter herb has great medicinal value.

According to Compendium of Materia Medica, amaranth is bitter in taste, mild in nature, slightly cold and non-toxic, and has the functions of clearing away heat and toxic materials, cooling blood, promoting diuresis, removing blood stasis and relieving pain, and eliminating pathogenic factors of five internal organs. In recent years, consumers have paid more and more attention to purple sowthistle because it can be used as a vegetable and has great medicinal value.

The growth environment of Sophora alopecuroides in Guannan is found in plains, hills, forests, grasslands, wasteland, fields, rivers and roadsides. The whole grass can be used as medicine, which has the functions of warming meridians, removing dampness, dispelling cold, stopping bleeding, diminishing inflammation and resisting allergy. The leaves are dried and mashed to obtain "bitter velvet". Distributed in the east of China.

The unique ecological environment in Guannan is conducive to the growth of Sonchus oleraceus, and the soil requirements of Sonchus oleraceus are not high. The unique soil in Guannan integrates various trace elements of sea and land, and the soil has good ventilation and water permeability, and the contents of organic matter, phosphorus, boron and manganese are appropriate. Sonchus oleraceus produced on this land is rich in trace elements.

Most of the high-quality purple bitter tea is produced here. The good ecological environment with distinct seasons and pleasant climate provides unique conditions for the growth of pure natural wild purple sowthistle, which is an important producing area of green pure natural purple sowthistle.

the above content reference: Baidu Encyclopedia-Bitter Cabbage Flower (Wild Vegetable Flower Name)