Ginkgo trees, are one of the oldest species of trees cultivated in China and are believed to be 150 to 200 million years old. The ginkgo trees grow in average soil and even in full sun. The tree can grow 100 – 120 feet. Ginkgo trees are very resistant to pollution and infection and hardly suffer any disease. Insects rarely attack these plants. Due to these reasons these trees are most tolerant even in urban conditions and are grown as shade trees.