The yellow-flowered plant used to make Qingming fruit is called Qingming grass, also known as rat grass, Qingming vegetable, cold food vegetable, and cotton vegetable.

Qingming grass is an annual grass. The whole plant has white wool, the leaves are as small as chrysanthemum leaves, and it has small flocculent yellow flowers. During the Qingming season, the white hair sprouts.

This grass is spread all over the country and can be seen everywhere on field slopes.

The best time to pick Qingming grass is before and after the Qingming Festival. At this time, the leaves are tender and juicy, and it can be mixed with flour or glutinous rice flour to make a fragrant delicacy.

Qingming grass is mild in nature and has the effects of resolving phlegm, relieving cough, lowering blood pressure and removing wind.