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Sweet Chestnut (Castanea species). Forest Chestnuts. The American chestnut (Castanea dentata) was one of the largest growing forest trees in eastern North America. It was important for timber as well as nuts for human use as well as wildlife.A deadly fungus disease, introduced from the Orient effectively wiped out this chestnut in the first half of the 20th century.he American chestnut (Castanea dentata) was one of the largest growing forest trees in eastern North America. It was important for timber as well as nuts for human use as well as wildlife. A deadly fungus disease, introduced from the Orient effectively wiped out this chestnut in the first half of the 20th century.
Chinese chestnut (Castanea mollissima) â Although some consider these nuts inferior in quality to those of the American chestnut, the tree is blight resistant and will grow to 40 feet tall producing good tasting nuts. Chinese chestnuts are hardy in USDA zone 4 and widely adapted across the country.hestnut burrs (fruits) contain the chestnut seeds or nuts that we love to eat. Chestnut blight is a fungus from Asia that spread throughout the eastern U.S. one hundred years ago, killing most wild chestnut trees in its wake.