Mao is the peak of spring and the only branch that is pure, unmixed Yin wood. Its hidden stem list is one name long, which makes it the most single-minded branch in the twelve — and the one whose behaviour is easiest to predict once you know which way it is growing.

卯 governs the second month of spring, when growth stops being individual and becomes general. Yin is one shoot breaking through; Mao is the whole field. The difference is social. Charts with strong Mao describe people whose progress is inseparable from other people's — they grow by being in a group that is growing, and they stall when the group does.
The branch is also the system's purest expression of aesthetic sense. Yi wood is the vine and the blade of grass, and the traditional reading gives Mao a strong association with refinement, presentation and taste. That is not decoration: it is the branch's actual mechanism. Yi grows by adapting its form to whatever it meets, so Mao charts are unusually sensitive to their surroundings in every sense.
卯 is also significant structurally because of its relationship with 酉 (the Rooster branch): they are the two wood and metal branches in direct opposition, and their clash is one of the sharpest in the system — the blade against the grass. Charts with both tend to describe lives organised around one recurring confrontation between adaptation and principle.
From the inside, Mao feels like constantly adjusting a presentation nobody has asked you to adjust. You notice the atmosphere of a room before you notice what is being said in it, and something in you starts editing accordingly. You are also aware, more than you would admit, of how much of your work is invisible: the version of yourself that finally appears in public has been through several drafts. When you are accused of being sensitive, there is some truth in it — but the more useful truth is that the sensitivity is the instrument you work with, not a defect to be managed.
| Hidden stem | Element | English | Polarity | Rank |
|---|---|---|---|---|
| Yi 乙 | 木 | Wood | Yin | main qi |
卯藏乙 alone. Yi (Yin Wood) has no company, which gives the branch its characteristic singleness: it bends in one direction at a time. In practice, a chart that needs wood and draws it from Mao gets flexible wood rather than Jia's rigid wood — the difference between adapting and holding the line.
| Relationship | Partners | What it means |
|---|---|---|
| Six Harmony (六合) | Xu 戌 | A fixed pairing read as natural rapport — the classical “good match” relationship between two branches. |
| Three Harmony (三合) | Wei 未 · Hai 亥 | Same elemental trine. Two branches of a three-branch combination share an element and are read as reading each other's instincts correctly. |
| Clash (冲) | You 酉 | Direct opposition, six positions apart. Read as movement and friction rather than as misfortune — the branches pull in opposite directions. |
| Punishment (刑) | Zi 子 | Punishment. Two or three branches in a relationship classically read as internal pressure, obligation and repeated friction. |
| Harm (害) | Chen 辰 | Harm. A quieter relationship than clash — small ongoing friction that compounds if unaddressed. |
| Break (破) | Wu 午 | Break. The least discussed of the branch relationships: a destabilising pairing, classically read as undermining rather than opposing. |
The Mao hour (05:00–07:00) is sunrise — the hour when the world becomes visible again. Charts with Mao as the hour branch tend to be people whose public work looks effortless and whose preparation happens entirely before anyone arrives.
In traditional medicine the branch is also assigned to liver, eyes and the nerves, which is why classical texts read chronic conditions through the branch that governs the season they began in.
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