Arbor Day in Germany
Arbor Day in Germany is held on April 25. This event in the third decade of the month April is annual. 
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Since 1952, Germany has celebrated the nationwide Arbor Day on April 25. In terms of content, it is continued in Germany in the Day of the Avenue on October 20, which has been celebrated since 2008.
However, the original initiative for a separate Arbor Day goes back almost 100 years to the U.S. journalist and farmer Julius Sterling Morton (1832 - 1902) and the year 1872. Morton had submitted the request for an Arbor Day resolution to the local government of the US state of Nebraska in that year.
Morton's request at the time: The state, which at the time was very low on trees, was to be reforested through the annual planting event. And with great success. On April 10, 1872, citizens and farmers in Nebraska planted more than one million trees.
Similar holidays and events, festivals and interesting facts
Days of protection from environmental hazards in Russia on April 22
Chemists Celebrate Earth Day in USA on April 22 (In 2003, the American Chemical Society joined in on April 22's festivities. Each year, ACS highlights one of four general topics and chooses a theme—this year it's "Our Earth: Handle With Care"—to focus the celebration and highlight how chemists can contribute to a greener world);
Save The Frogs Day on April 27
Birthday of the World Wildlife Fund on April 29 (Date of foundation of the WWF April 29, 1961, Morges, Switzerland);
Tree Planting Day in Colombia on April 29
Spring Decade of Birdwatching on May 1 (May 1-10);
Garbage Day in Japan on May 3 (Gomi No Hi)