The horse-chestnut or conker tree (Aesculus hippocastanum) is the first tree in our forest that losts its leaves in autumn (actually even in August), but it is the first one having them back.
The common name "horse-chestnut" (often unhyphenated) is reported as having originated from the erroneous belief that the tree was a kind of chestnut (though in fact only distantly related), together with the observation that eating the fruit cured horses of chest complaints despite this plant being poisonous. This tree species is native to the Pindus Mountains mixed forests and Balkan mixed forests.
One horse-chestnut tree is famous in Geneva and called the official horse-chestnut because the first leaf bud burst marks the beginning of spring every year.
Another famous horse-chestnut tree that lived in the city center of Amsterdam used to be called The Anne Frank tree (Dutch: Anne Frankboom) because she mentioned it in The Diary of a Young Girl.