Why did Tomb-Sweeping Day chop willow branches?

Origin of willow cuttings in Tomb-Sweeping Day;

The custom of planting trees by inserting willows in Tomb-Sweeping Day is said to commemorate Shennong who invented various agricultural production tools and tasted all kinds of herbs. On the other hand, it is said that the willow tree that meson held when he died came back to life. Jin Wengong named it Qingming Willow and folded it into a circle to wear on her head. This custom was later introduced to people. Although the sources of allusions are different, these customs are still inseparable from the joy of people returning to the earth in spring.

Another way of saying it is that this custom is to commemorate meson push. Jietui set himself on fire under the willow tree to keep the festival, which made Jin Wengong, his ministers and people feel sad. The next year, when Jin Wengong personally led the ministers to climb the mountain to worship Jiexiu, he found that the old willow trees that had been burned in those years had actually come back from the dead. Jin Wengong named the old willow in front of him "Qingming Willow", and on the spot, he broke off a few branches and put them on his head to show his memory. Since then, officials and people have followed suit and followed suit. It has become a symbol to commemorate meson push.