Xu is the eleventh of the Twelve Earthly Branches, belonging to Yang Earth, associated with the Dog zodiac sign, and corresponds to the Xu Hour (19:00–21:00). Xu Earth represents the dry Earth of Late Autumn; it internally conceals Wu Earth, Xin Metal, and Ding Fire. Its nature is dry and loyal, symbolizing loyalty, protection, and the power of justice. Xu Earth serves as the 'Fire Repository', embodying the imagery of storing light and brilliance.
Xu Earth is identified from the Earthly Branches in the Four Pillars of Destiny chart. If Xu appears in the Year Branch, the native belongs to the Dog zodiac; if Xu appears in the Day Branch, the Spouse Palace is Xu Earth. Xu Earth is strongest during the Xu Month (ninth lunar month).
A person born on a Ren-Xu Day has Xu Earth as the Seven Killings in the Day Branch, suggesting a spouse with a strong, righteous personality.