American holly is a native evergreen tree or shrub known for its glossy, dark green leaves and bright red berries. It typically grows between 15 to 30 feet tall and is often used in landscaping for its attractive appearance. The leaves are spiny and can be quite sharp, which helps protect the plant from herbivores. This plant, scientifically known as Ilex opaca, is commonly found in the eastern United States. American holly is also significant during the holiday season, as its berries and foliage are often used in Christmas decorations. The berries are toxic to humans but provide food for various birds.