Adult Acorns are a term used to describe mature oak trees. They are usually found in forests and woodlands, and can reach heights of up to 100 feet. Adult Acorns are characterized by their thick trunks and large, spreading branches. The leaves of an adult acorn are typically dark green and glossy, and the bark is usually gray or brown. Adult Acorns are important for providing food and shelter for wildlife, as well as providing shade and beauty to the landscape.