The holiday of Arbor Day is when individuals and communities are encouraged to plant trees. The holiday actually started in 1872 in Nebraska but has become a world wide holiday. Making the holiday global is credited to Birdsey Northrop. The date of the holiday varies by state and is dependent on when the best planting time is. Some of the countries that participate in arbor day are: Japan, Kenya, Germany, Egypt, Costa Rica, Australia, Belgium, Brazil and Venezuela.