The ginkgo is a tall, pyramidal tree with gray bark, pale wood, and fan-shaped leaves. When the tree is mature, its branching is usually erratic, but the lateral branching of younger trees is often regular. The ginkgo is deciduous and the normally soft green leaves change colors in the autumn before they fall off in some locales. The tree is also dioecious, with the male trees being more commonly planted because the fleshy fruit of the female ginkgo is generally considered to have an offensive odor. The shelled seeds of the ginkgo are edible and are traditionally consumed in China. The seeds are considered to have health benefits by some, but more commonly today extracts from the leaves of the ginkgo are included in various health supplements that are purported to improve concentration, memory, and metabolism.