Native to:
Afghanistan,
China North-Central,
China South-Central,
China Southeast,
Japan,
Korea,
Manchuria,
Nepal,
Pakistan,
Tibet,
West Himalaya
Introduced into:
Alabama,
Arkansas,
Assam,
Azores,
Belgium,
Cambodia,
Connecticut,
Costa Rica,
Delaware,
District of Columbia,
East Himalaya,
Florida,
France,
Georgia,
Germany,
Great Britain,
Hawaii,
Illinois,
Indiana,
Iowa,
Ireland,
Kansas,
Kentucky,
Louisiana,
Maine,
Maryland,
Massachusetts,
Michigan,
Minnesota,
Mississippi,
Missouri,
Montana,
Nebraska,
New Brunswick,
New Hampshire,
New Jersey,
New York,
North Carolina,
Nova Scotia,
Ohio,
Oklahoma,
Ontario,
Oregon,
Pennsylvania,
Rhode I.,
South Carolina,
Tadzhikistan,
Tennessee,
Vermont,
Virginia,
Washington,
West Virginia,
Wisconsin