What does dogwood mean in Double Ninth Festival?

I am a lonely stranger in a strange land, and I miss my family more often during the holidays.

When I think of my brothers' bodies climbing high, I will feel a little regret for not being able to reach me.

Cornus officinalis is nicknamed "evil-ward Weng", and the custom of worshipping Cornus officinalis on the Double Ninth Festival is very popular in the Tang Dynasty. People think that inserting Evodia rutaecarpa in the Double Ninth Festival can take refuge and eliminate disasters. Or wear it on your arm, or make a sachet, put Cornus officinalis in it, called Cornus officinalis bag, and some are inserted in your head. Most of them are worn by women and children, and in some places, men also wear them. Ge Hong's Miscellanies of the Western Classics in the Jin Dynasty recorded that Kaunus participated in the Double Ninth Festival. Besides wearing dogwood, people also wear chrysanthemums. This happened in the Tang Dynasty and has been popular since ancient times. In the Qing Dynasty, the custom of Beijing Double Ninth Festival was to stick chrysanthemum branches and leaves on doors and windows, "to get rid of evil and filth, and to make money into treasure". This is the vulgarization of the chrysanthemum on the head. In the Song Dynasty, some people cut ribbons into dogwood and chrysanthemum and gave them to each other.