Ginkgo biloba (Maidenhair tree): Ecology
	Habitat: The ginkgo is a drought-resistant, adaptable species, and is very cold hardy-thriving from zone 3 to 9. It is also very pH adaptable, tolerates air pollution and soil salt pollution, making it an ideal candidate for adverse urban conditions. Although it will grow in almost any conditions, it prefers deep, sandy, moist soil and requires full sun. Diseases: It is generally resistant to insect pests and fungus attack. Some negligible leaf spot attack has been reported.	Distribution: Ginkgos were once native throughout the Northern Hemisphere, but were rendered extinct in North America and Europe during the Pleistocene Ice Age. They survived in the Yangste River valley in eastern China where they still grow today. The ginkgo has been cultivated for centuries in China and Japan and it is a sacred tree in the Far East. It grows well in Minnesota, Georgia, Florida and in zones 8 and 9 of the southeast. It is a common urban planting in many Iowa cities.