Arbor Day also known as National Tree Planting Day is a holiday in which individuals and groups are encouraged to plant and care for trees. The People's Republic of China celebrates Arbor Day on March 12. We eat food from trees .We get wood from trees to build our houses. We make paper from trees, too. On Arbor Day we plant new trees. Children help to do the work. Many trees begin their lives on this day. It is a kind of birthday for trees. Next Arbor Day you can say：“Happy birthday, trees!” Some of the basic: The History Origin Of Arbor Day The Habit & Custom in China and Globe Outdoor Special Activity This great outdoor activity will surely give children more fun and also unique knowledge.