The willow tree is a type of tree known for its long, slender branches and narrow leaves. It typically grows near water sources, such as rivers and lakes, and can reach heights of 30 to 50 feet. There are several species of willow, including the weeping willow, which is famous for its drooping branches. Willow trees are deciduous, meaning they lose their leaves in the fall. They are often used in landscaping for their graceful appearance and ability to provide shade. Additionally, the bark of some willow species contains salicylic acid, which is a natural precursor to aspirin.