wu-yin day pillar

寅 is a wood branch and wood controls earth, yet 戊 is assigned Growth at this seat. The reason lies in how the method treats earth: it follows fire, which is also born at 寅. 三命通會 卷二 reaches the point by another road, through the mountain: 寅乃艮方，艮为山，戊土长生于是, 寅 is the 艮 direction, 艮 is a mountain, and 戊 earth has its Growth here.

Other lines in the old handbooks disagree. Earth paired with water, as in 三命通會 卷三 and one list in 神峰通考, would put Sickness at 寅 if carried through, and 五行大義 says only that earth travels as a lodger through 寅 on the way to its birth at 卯.

城頭土, Earth on the City Wall, is the 納音, and 三命通會 卷一 writes 堤阜城郭, embankments, mounds and city walls. It says 喜木及火, pleased by wood and fire, and the branch happens to hold both, with 甲 as Seven Killings and 丙 as Indirect Resource among its hidden stems. The third stem is 戊 itself, a Friend.