Native to:
Amur,
China North-Central,
China South-Central,
China Southeast,
Hainan,
Japan,
Khabarovsk,
Korea,
Kuril Is.,
Manchuria,
Nansei-shoto,
Primorye,
Qinghai,
Sakhalin,
Taiwan,
Thailand,
Vietnam
Introduced into:
Alabama,
Alaska,
Arkansas,
Austria,
Baltic States,
Belgium,
British Columbia,
Bulgaria,
California,
Central European Rus,
Colorado,
Connecticut,
Czechoslovakia,
Delaware,
Denmark,
District of Columbia,
Finland,
Florida,
France,
Georgia,
Germany,
Great Britain,
Hungary,
Idaho,
Illinois,
Indiana,
Iowa,
Ireland,
Italy,
Kansas,
Kentucky,
KwaZulu-Natal,
Louisiana,
Maine,
Manitoba,
Maryland,
Massachusetts,
Michigan,
Minnesota,
Mississippi,
Missouri,
Montana,
Nebraska,
Netherlands,
New Brunswick,
New Hampshire,
New Jersey,
New York,
New Zealand North,
New Zealand South,
Newfoundland,
North Carolina,
North Caucasus,
Norway,
Nova Scotia,
Ohio,
Oklahoma,
Ontario,
Oregon,
Pennsylvania,
Poland,
Portugal,
Prince Edward I.,
Québec,
Rhode I.,
Romania,
South Carolina,
South Dakota,
South European Russi,
Spain,
Sweden,
Switzerland,
Tasmania,
Tennessee,
Transcaucasus,
Ukraine,
Utah,
Vermont,
Virginia,
Washington,
West Virginia,
Wisconsin,
Yugoslavia