Hidden stems: what a branch keeps inside.

An Earthly Branch looks like a single character, but it is really a small container. Inside each one sit one to three Heavenly Stems — the hidden stems (藏干, Cáng Gān). They never show on the surface of a chart, yet they decide much of what the chart actually means. They are the reason you cannot read BaZi by counting characters.

What is inside each branch

Here is the full table. Where a branch holds more than one stem, the first is the main qi (the dominant one, matching the branch's own element); the rest are weaker middle and residual influences.

■ main qi · the dominant hidden stem. Notice the four "pure" branches — 子 卯 酉 and very nearly 午 — that hold essentially one stem, and the four Earth branches (丑 辰 未 戌) that hold three, which is what makes Earth so mixed.

Why they matter

• Roots. A Day Master that finds its own element among the hidden stems of a branch is rooted — anchored and far stronger than a stem floating with no support beneath it. Roots, not surface allies, are what most often decide strength.
• Hidden Ten Gods. A branch can quietly introduce a Ten God — wealth, authority, resource — that appears nowhere among the visible stems. Whole themes of a chart can live entirely inside the branches.
• Why counting fails. Because so much sits hidden, tallying the visible characters gives the wrong answer. This is the core reason a chart is weighed, not counted.

Main, middle, residual

When a branch holds three stems, they are not equal partners. The main qi (本气) is dominant and sets the branch's own element. The middle and residual qi are fainter — often a trace of the previous season, or a stem waiting to activate if the right combination forms elsewhere in the chart. A reading weights them accordingly rather than treating all three as one.

Keep going: the stems and branches themselves, is your Day Master strong or weak?, the Ten Gods, or how the chart is calculated.