Duānwǔjié shí rénmen zài mén shàng guà chāngpú hé àicǎo.
At the Dragon Boat Festival people hang calamus and mugwort, 菖蒲 and 艾草, on their doors.
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菖 never stands alone; it occurs only in 菖蒲, the sword-leaved water plant hung at the Dragon Boat Festival to ward off ill fortune. It is the grass radical 艹 over 昌 for the sound.
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Bound — appears only in the plant name 菖蒲, not as a free word.