Description. Sycamore trees produce large leaves that have a distinctive deep green. These plumes of leaves grow on branches that can reach up to 175 feet tall. As the leaves measure up to 6 inches long, a fully grown sycamore tree can be one of the densest trees in appearance.ycamore trees produce large leaves that have a distinctive deep green. These plumes of leaves grow on branches that can reach up to 175 feet tall.