The custom of traditional Japanese tug-of-war, or tsunahiki (綱引), can be outlined as follows:\n\n• It is practiced on different annual events, such as Ko-syogatsu (小正月), or New Year celebration around 15 January according to the lunar calendar), Obon festival (盆)celebrated around 15 August, the Boys’ Festival on 5 May (端午節句), or the fifteenth night of August of the lunar calendar (八月十五夜).\n• The tug-of-war ropes are made of either straw, kaya (kind of cogon grass often used as traditional roofing materials), or shobu (菖蒲 or sweet sedge).\n• A village is divided into two groups of farming and fishing areas, eastern and west-ern areas, and upstream and downstream areas, and in some cases, the two groups are subdivided into smaller groups such as children and young adults as well as men and women.\n• The rope is tugged by these groups, or dragged around, slammed against the ground, or sometimes cut into pieces.\n• The purpose of this traditional event is said to forecast the volume of the coming harvest, to ward off evil spirits, or to pray for a peaceful life.

About 2,000 years ago, Korean people started using the sedge plant, according to the ancient record of Samguksagi (The Historical Record of Three Kingdoms), which refers to the use of the plant to make a palanquin curtain.