When did China plant trees in ancient times?

In ancient China, there was a tradition of inserting willows and planting trees in Tomb-Sweeping Day. The earliest roadside tree planting in history was initiated by a man named Wei Xiaokuan in Shaanxi more than 400 years ago. Wei Xiaokuan (508-580 AD) was a famous soldier in the Western Wei and Northern Zhou Dynasties. He was born in Jingzhao Ling Du (now southeast of Xi 'an).

The modern Arbor Day was first initiated by Nebraska. 19 century ago, Nebraska was a barren plain with few trees and yellow sand all over the sky, and people suffered greatly. 1872, Julius Sterling Moreton, a famous American agronomist, proposed to stipulate Arbor Day in Nebraska to mobilize people to plant trees in a planned way.