The Old Elm (, ) is a centuries-old tree of the species field elm that grows in the center of Sliven, Bulgaria. It is one of the symbols of the city. The tree has been declared a protected site, which is guarded by the state. It represents a remnant from an ancient forest. In 2014, the tree started to show symptoms of the Dutch elm disease. The tree is present in Sliven's coat of arms and won the European Tree of the Year in 2014.
Overview.
The Old Elm is an ancient tree from the species field elm that grows in the center of Sliven, Bulgaria next to the city hall and at the start of the main pedestrian alley. It is one of the symbols of the city. The tree is approximately 1100 years old and has a height of about 10 meters. The tree's perimeter is . The trunk circumference at its root is over . The tree is designated as a protected site which is guarded by the state. The tree is cared by specialists from the University of Forestry and continuous care for The Old Elm is a priority for the Sliven Municipality.
History.
During the Middle Ages, the region around central and western part of Sliven was not settled yet and housed an ancient forest named the Great Bulgarian Forest. The Old Elm of Sliven is one of the last remaining representatives of the forest, which historically stretched from the Rhodope Mountains to the Black Sea. The other surviving remnants of this forest consist of roughly twenty elm specimens near the village of Samuilovo, located approximately southeast of Sliven. Each of these trees has been officially recognized and protected as a natural landmark by the Bulgarian government. During the Ottoman rule in Bulgaria, the Old Elm reportedly served as a site for the execution of captured hajduci (rebel fighters) by the Ottoman Turks. According to the bulgarian footballer Damyan Damyanov: 
Disease and decline.
In 2014, early signs of decline in the tree's health became apparent due to infection by Dutch elm disease—a fungal illness spread by bark beetles that obstructs the tree's vascular system, preventing water transport and leading to rapid dieback. By 2018, the disease had progressed significantly, and the tree's decayed central core and weakened structure necessitated a partial removal of its skeletal branches and much of its desiccated crown in a controlled sanitation cutting. Part of the tree's stem is cemented to preserve it and give it more stability. To slow the further spread of infection, sections of dead bark were also removed. Despite these measures, the tree's health deteriorated rapidly. In June of the same year, its mostly green crown turned yellow and dried out completely within several days. Because of this, there was a public debate on whether to replace the tree. In 2025, it was reported that the chances of The Old Elm surviving were becoming increasingly hopeful. According to Stefan Stefanov, it was because of two living branches, which are about high from the ground and are 4 years old. He concluded that because the branches are alive, the root is alive too.
Cultural significance.
The Old Elm tree is an important part of the cultural and social life in Sliven. In the past, the altitude of the city was measured under the tree. People of Sliven regularly arrange meetings under the tree. Since 1995, the Old Elm has been present in the coat of arms of Sliven. In 2018, the Bulgarian National Bank issued a ten-leva silver commemorative coin "The Old Elm in Sliven" in a circulation of 3,000 pieces.
European Tree of the Year.
In 2014, The Old Elm won the "European Tree of the Year" by 77,523 votes, more than twice of the second place "The Giant Pear of Gödöllő" in Hungary, which had 36,925 votes. Municipal officials credited the overwhelming outcome to an aggressive "get-out-the-vote campaign" organized by the youth of Sliven. In the same year, a postage stamp "The Old Elm - European Tree of the Year" was validated by "Bulgarian Posts".