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This is a post from one of our AIWC members who wrote the blog, Schwingen in Switzerland.

How do you know spring has arrived?  Flowers, spring showers, sundresses or swimming in the lake?  In Geneva’s old town, there is a tree, a chestnut, that is the official harbinger of spring.  Well, maybe it’s only the quasi-official harbinger, but it’s good enough.  In Geneva’s Old Town, on the Promenade de la Treille, is a tree whose first bud marks the official arrival of spring (Marronnier Officiel).  It’s known as “l’eclosion” which translates as “the hatching” or “the blooming” but in this case means “the budding.”

The first bud was charted since 1808!  It has always come sometime between January and the beginning of April, varying considerably (but generally getting progressively earlier).  In 2012, it arrived on March 13!

Since observations began, several trees have been used.  The original from 1818  to 1905, the second from until 1928,  and the current since 1929.  The current tree is so bent over that it has to be propped up with a pole.

In 1808, Marc-Louis Rigaud-Martin began recording the tree’s first bud, likely out of a kind of scientific curiosity.  Since 1818, all the dates have been recorded on a parchment-roll in a special place in Geneva’s State Council chamber.

Workers of the city stroll past the tree over periodically during the key months and even use binoculars to examine the tree in greater detail.  Once, an employee hastily returned from vacation during exceptionally warm weather to avoid missing it!  They know exactly where on the tree to look as the first buds always appear on the eastern side.

We are a group of international women living in Geneva, Switzerland.  If you would like to join the AIWC, please visit our website at http://www.aiwcgeneva.org/.

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