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| Geneva official chestnut tree | |
|---|---|
 The Geneva official chestnut tree in 2011 | |
  Geneva official chestnut tree Geneva, Switzerland | |
| Species | Horse chestnut (Aesculus hippocastanum) |
| Coordinates | 46°12′02″N 06°08′47″E / 46.20056°N 6.14639°E |
The Geneva official chestnut tree is a horse chestnut tree planted in Geneva, Switzerland. Every year, the tree is observed by the secretary of the Grand Council of Geneva (the local parliament), and the opening of the first leaf is recorded and announced publicly as indicating the beginning of the spring.
The series of records started in 1818; it forms the oldest set of records of phenological events in Switzerland and is one of the living traditions in Switzerland.[1] In 2023, the first leaf was observed on 3 March, slightly earlier than the observations made in recent years (in 2022, it was observed on 10 March[2])
- ^ "Botany in Geneva and the 'marronnier de la Treille'". Living traditions in Switzerland, Federal Office of Culture. Retrieved 11 December 2022.
- ^ Bretton, Marc (10 March 2022). "Sur la Treille, le bourgeon est de sortie" (in French). Tribune de Genève. Retrieved 11 December 2022.