Arbor Day is a holiday in which individuals and groups are encouraged to plant and care for trees. Cambodia celebrates the arbor day on 9th of July each year. Here is a stamp issued by the Kingdom of Cambodia on July 22, 1966 to celebrate the Arbor Day.
First Arbor Day in the world :
The Spanish village of MondoƱedo held the first documented arbor plantation festival in the world organized by its mayor in 1594. The place remains as Alameda de los Remedios and it is still planted with lime and horse-chestnut trees. A humble granite marker and a bronze plate recall the event.
Additionally, the small Spanish village of Villanueva de la Sierra held the first modern Arbor Day, an initiative launched in 1805 by the local priest with the enthusiastic support of the entire population.