Ginkgos (Ginkgo biloba) are large trees, normally reaching a height of 20–35 m (66–115 feet), with some specimens in China being over 50 m (164 feet). The tree has an angular crown and long, somewhat erratic branches, and is usually deep rooted and resistant to wind and snow damage. Young trees are often tall and slender, and sparsely branched; the crown becomes broader as the tree ages. During autumn, the leaves turn a bright yellow, then fall, sometimes within a short space of time (1–15 days). A combination of resistance to disease, insect-resistant wood and the ability to form aerial roots and sprouts makes ginkgos long-lived, with some specimens claimed to be more than 2,500 years old.
Ginkgo biloba extract has been used therapeutically in China for millennia. According to fossil records, the ginkgo tree has been around for over 200 million years and is one of the oldest still existing tree species on earth. Individual trees live up to 1,000 years. Like ginseng, it is mentioned in the traditional Chinese pharmacopoeia. Ginkgo biloba extracts are among the most widely studied and prescribed drugs in Europe to alleviate symptoms associated with a wide range of conditions. The main indications are in peripheral vascular disease and the therapy of age related cognitive decline. It is also is a mind booster underutilized by the medical profession. The benefit of this herb and its extract to prevent Alzheimer's disease has not been proven.
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