Arbor Day (or Arbour; from the Latin arbor, meaning tree) is a holiday in which individuals and groups are encouraged to plant and care for trees. Today, many countries observe such a holiday. Though usually observed in the spring, the date varies, depending on climate and suitable planting season.
In 1981, the fourth session of the Fifth National People's Congress of the People's Republic of China adopted the Resolution on the Unfolding of a Nationwide Voluntary Tree-planting Campaign. This resolution established the Arbor Day (Chinese: 植树节) and stipulated that every able-bodied citizen between the ages of 11 and 60 should plant three to five trees per year or do the equivalent amount of work in seedling, cultivation, tree tending or other services. Supporting documentation instructs all units to report population statistics to the local afforestation committees as the basis for workload allocation. The People's Republic of China celebrates Arbor Day on March 12, a day founded by Lin Daoyang, continue to use following the date of Arbor Day of Republic of China.