Arbour Day had its origin in the mid-nineteenth century in the treeless badlands of Nebraska. It became traditional to plant trees on this day.
On 27 November 1951, the United Nations established an International Day of Trees. This day is meant to remind people of the importance of forests for humankind, but also for industry.
The German "Tag des Baumes" (Arbour Day) was first celebrated on 25 April 1952. Theodor Heuss, Federal President, and Robert Lehr, president of the Society for Protection of German Forests (Schutzgemeinschaft Deutscher Wald) and also federal minister of the interior, planted a maple tree in the Hofgarten in Bonn.