People believe plenty evil things would revive in May. Hence on the Dragon Boat Festival, people in Beijing tend to hang calamus and mugwort on the door or walls of their house to repel evil things. The leaf of calamus resemble the sword in shape, hence, calamus is also known as water sword. People also make accessories by using calamus, and give them to children. Because they consider the water sword is able to kill evil things and keep children safe. Some people use the root of calamus to make wine to pursuit longevity.
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