Castanea mollissima

Species of tree

Castanea mollissima, also known as the Chinese chestnut, is a species of chestnut tree in the family Fagaceae that is native to China, Taiwan, and Korea.

When cultivated close to other species of chestnut (including Japanese chestnut, American chestnut and sweet chestnut), Chinese chestnut readily cross pollinates with them to form hybrids. Chinese chestnuts have evolved over a long period of time in coexistence with the bark fungal disease chestnut blight (Cryphonectria parasitica, formerly Endothia parasitica), and have evolved a very successful resistance to the blight, probably more so than any other species of chestnut, so that, although it is not immune, it typically sustains no more than minor damage when infected. It's important to realize, though, that Chinese chestnut trees vary considerably in blight resistance. Some individuals are quite susceptible while others are essentially immune to the disease. Japanese chestnut is also comparatively resistant to blight, with European chestnut somewhat less so. In the 1890s, Chinese and Japanese chestnuts were imported to the United States with the intention of utilizing them as orchard trees due to their small, compact size compared to the towering American chestnut. The results unfortunately were disastrous as the imported Asian species introduced blight to which C. dentata lacked any resistance. The disease was first noticed on a tree in the Bronx Zoo in 1904 and quickly spread out of control, ravaging American chestnut trees. Within 30 years, there were virtually none left in their native range. An active program has been pursued in North America to cross breed the Chinese and American chestnuts to try to maximize various desirable traits of the American chestnut, such as larger stature, greater nut sweetness, while also isolating and carrying the blight resistance from the Chinese chestnut.

The nuts are edible, and the tree is widely cultivated in eastern Asia; over 300 cultivars have been selected for nut production, subdivided into five major regional groups: Northern, Yangtze River Valley, Sichuan and Guizhou, Southern, and Southwestern. Besides that, the Dandong chestnut (belonging to the Japanese chestnut – Castanea crenata) is a major cultivar in Liaoning Province. Some cultivars, such as 'Kuling', 'Meiling', and 'Nanking', have large nuts up to 4 cm diameter. The nuts are sweet, and considered by some to have the best taste of any chestnut, though others state they are not as good as the American chestnut. The nuts also provide a significant food source for wildlife.