Pine leaves, also known as needles, are the slender, elongated foliage of pine trees, which belong to the Pinaceae family. These leaves are typically green and can vary in length, depending on the species. Pine needles are adapted to withstand harsh weather conditions, allowing the tree to conserve water and survive in various environments. Pine needles grow in clusters, usually in groups of two to five, and can remain on the tree for several years before falling off. They play a crucial role in photosynthesis, helping the tree produce energy. Additionally, pine needles can be used for mulch and are often associated with the scent of Christmas due to their use in holiday decorations.