Salix fragilis, commonly known as crack willow, is a species of willow tree native to Europe and parts of Asia. It typically grows near water bodies, such as rivers and lakes, and can reach heights of up to 20 meters. The tree is characterized by its long, slender branches and narrow, lance-shaped leaves that turn yellow in the fall. This species is known for its ability to thrive in wet conditions and is often used for erosion control along riverbanks. Salix fragilis produces catkins in early spring, which are important for local wildlife, providing food for various insects and birds.