It has the functions of expelling wind, reducing fever, diuresis, promoting blood circulation, detoxicating and reducing swelling.
It can be used for treating common cold and fever, rheumatic bone pain, infantile convulsion, dysuria, diarrhea, hernia, traumatic injury, heat toxic ulcer and eczema.
The fear of grass is probably nettle, which is a quadrangular stem.
The picture comes from the Internet.