Acorus calamus is a kind of spirit grass which can prevent epidemic and drive away evil spirits in China traditional culture. It is also called "elegant flowers and plants" with orchids, daffodils and chrysanthemums. Acorus calamus first woke up at the end of winter, hence its name. Acorus calamus is "no color, no land" and "bitter and cold-resistant, peaceful and indifferent". When it was born in the wild, it was full of vitality, plump and moist, but when it was in the hall, it was slim and elegant, delicate and lovely, and it has won people's love since ancient times. Every Dragon Boat Festival in the south of the Yangtze River, people hang calamus and mugwort leaves on doors and windows and drink calamus wine to ward off evil spirits and avoid epidemics. On summer and autumn nights, the custom of burning calamus and mugwort leaves to repel mosquitoes and insects has been maintained to this day. Moreover, in ancient China, Acorus calamus has always been a medicinal plant. Moxibustion in acupuncture uses wormwood as the main component and burns it at acupoints to treat diseases. The legend that wormwood can exorcise evil spirits has been circulating for a long time, mainly because it has the function of medicine. For example, Zonggu's Chronicle of Jingchu records that "when chickens are not crowing, those who pick wormwood look like people, take it and collect it with moxibustion, which is very effective." On this day, Ai Cai became a human figure, hung on the door, and could cast poison gas. "Most people also have the custom of planting wormwood before and after the house for good luck. People in Taiwan Province Province also put up "afternoon couplets" on the Dragon Boat Festival, which have the same function as amulets. There is a saying in some afternoon couplets: "Holding a strange love will attract a hundred blessings, and hanging a sword to close the door will kill a thousand evils". The folk significance of banyan branches can make the body strong. " It is braver to insert banyan trees and braver to insert mugwort leaves. "

Lu You has poems: Wild Goose Mountain, Acorus calamus, Kunshan Stone, which are praised by Chen Sou to comfort the silence.

There is also Jie Jin's "Acorus calamus": three feet are green and ancient, and the dance style breaks a wave. The long bridge is afraid of shadows and dragons, and the running water is silent and grinds day and night. The smoke on both sides of the strait is murderous, and even the rain and fishing songs are played. Qiu Lai is afraid that the west wind will become evil, and it will become more hatred. .