Birch leaves are the foliage of the birch tree, a common tree found in many temperate regions. These leaves are typically triangular or oval in shape, with serrated edges and a pointed tip. They are bright green in spring and summer, turning yellow in the fall before they drop. The leaves grow alternately on slender branches and can reach up to 3 inches long. They play a crucial role in photosynthesis, helping the tree convert sunlight into energy. Additionally, birch leaves are known for their medicinal properties and are sometimes used in herbal remedies.