Chestnuts are tall trees that produce sweet-tasting nuts and useful wood. There are four species of chestnut tree: American, European, Chinese, and Japanese.
Chestnut trees can grow to a height of about 30 meters. The bark has deep grooves. The leaves are shiny green and oval-shaped with pointed edges. The nuts are found inside green, cupshaped structures with a spiky shell.
In Geneva there is a tradition to declare the coming of spring when the first leaf appears on the “official chestnut tree”. The tradition is more than 2 centuries old. According to statistics, most often spring was announced in March. However, in 2002 the leaves appeared on December 29. 2006 was the most paradoxical year: first the spring was announced in March, and then again in October, as the tree suddenly blossomed again.