Native to:
China North-Central,
China South-Central,
China Southeast,
Korea
Introduced into:
Alabama,
Arkansas,
Assam,
Austria,
Bangladesh,
Belgium,
Bulgaria,
Central European Russia,
Colorado,
Connecticut,
Costa Rica,
Cuba,
Czechoslovakia,
Delaware,
District of Columbia,
Dominican Republic,
East Himalaya,
Florida,
France,
Georgia,
Germany,
Great Britain,
Haiti,
Honduras,
Hungary,
Idaho,
Illinois,
Indiana,
Iowa,
Ireland,
Italy,
Jamaica,
Japan,
Kansas,
Kentucky,
Kirgizstan,
Leeward Is.,
Louisiana,
Maine,
Maryland,
Massachusetts,
Mexico Central,
Mexico Northeast,
Mexico Southeast,
Mexico Southwest,
Michigan,
Minnesota,
Mississippi,
Missouri,
Montana,
Nebraska,
Nepal,
New Brunswick,
New Hampshire,
New Jersey,
New York,
New Zealand North,
New Zealand South,
North Carolina,
North Caucasus,
North European Russia,
Nova Scotia,
Ohio,
Ontario,
Pakistan,
Panamá,
Pennsylvania,
Primorye,
Prince Edward I.,
Puerto Rico,
Québec,
Rhode I.,
Romania,
South Carolina,
South Dakota,
South European Russia,
Spain,
Switzerland,
Tennessee,
Texas,
Tibet,
Transcaucasus,
Turkey,
Ukraine,
Utah,
Uzbekistan,
Vermont,
Virginia,
Washington,
West Himalaya,
West Virginia,
Windward Is.,
Wisconsin,
Yugoslavia