Salix koreensis Andersson

From the Joseon period (1392-1910), raw materials traditionally used for paper production, mainly bark of Broussonetias begin to fail. Papermakers face to a growing demand for paper stimulated by the development of publications initiated during the Goryeo period (907-1392). Other plants will be used to provide a fiber supplement such as wisteria, rice, oat and barley straws, bamboo, jute, cotton and hemp but also reeds, the bark and needles of pine, the leaves of willow. Indeed, the willow leaves seem to be used as a complementary fiber source to fibers of paper mulberry from the 15th century.