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Marronnier Officiel

Marronnier Officiel
Photo: Romano1246, CC BY-SA 3.0 (licence)

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.

From Wikipedia, CC BY-SA 4.0.

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Updated 30 Sept 2026. Something wrong? Tell us.