These would then be displayed in front of the home to ward off bad fortune and evil spirits. The people of ancient Japan would also gather medicinal herbs to prevent illness. These customs remain alive today. The Japanese have a May 5th custom of eating kashiwamochi (rice cakes filled with sweet bean paste and wrapped in oak leaves) and soaking in a hot tub or hot spring filled with iris leaves.
是以這一天，日本家庭都習慣吃柏葉包的麻薯和洗菖蒲葉浴。