An Icho is the Japanese name for the Ginkgo biloba tree, a species that has existed for over 200 million years. It is also known as the maidenhair tree or the living fossil. Icho is often used for bonsai because of its distinctive fan-shaped leaves, which turn bright yellow in autumn. Icho bonsai can be grown in various styles, such as formal upright, slanting, or broom. Some Icho bonsai may also produce aerial roots or chichi, which are considered a sign of age and beauty. Icho bonsai require full sun, well-drained soil, and moderate watering. They are also tolerant of cold and pollution.