 Old Tjikko is estimated to be at least 9 @,@ 550 years old , making it the world 's oldest known individual vegetatively cloned tree . It stands 5 metres ( 16 ft ) tall and is located on <unk> Mountain of Dalarna province in Sweden . For thousands of years , the tree appeared in a stunted shrub formation ( also known as a krummholz formation ) due to the harsh extremes of the environment in which it lives . During the warming of the 20th century , the tree sprouted into a normal tree formation . The man who discovered the tree , Leif <unk> ( Professor of Physical Geography at Umeå University ) , has attributed this growth spurt to global warming , and given the tree its nickname " Old Tjikko " after his late dog . 
