Basketry Willow, also known as OSIER (5 letters), is a type of willow tree that is used for weaving baskets and other objects. It is a species of willow native to Europe and parts of Asia, and is characterized by its long, flexible branches. The wood is strong and durable, making it an ideal material for basket-making. Basketry Willow is also used in furniture-making, and its bark is used for medicinal purposes.