I Ching coins vs yarrow stalks
Two ways to ask the same oracle — one ancient and slow, one practical and quick. Here is what actually differs.
The yarrow stalk method is the older ritual, described in the I Ching's own commentary tradition; the three-coin method is a later, faster simplification that became standard for Liuyao. Both yield the same 6/7/8/9 line values with a moving line one time in four — but with different odds for old yang versus old yin. For most practitioners, coins are the practical choice; the stalks are the contemplative one.
Yarrow — named for the older ritual — casts with the classical three-coin method of Liuyao and explains every line it produces.
Every I Ching reading begins the same way: six lines, built one at a time from the bottom up, each line landing as old yin (6), young yang (7), young yin (8), or old yang (9). What differs between traditions is the instrument that generates those numbers — a bundle of fifty dried stalks manipulated through a long division ritual, or three coins tossed six times. This guide covers where each method comes from, what the mathematics actually says, and how to choose.
The yarrow stalk method: the oracle's own account
The stalk method is the only casting procedure the I Ching describes for itself. The Xici zhuan (系辭傳, the Appended Statements or Great Treatise) preserves the canonical passage: 大衍之數五十，其用四十有九 — "The number of the Great Expansion is fifty; of these, forty-nine are used." The text then sketches the ritual: divide the forty-nine stalks into two heaps to represent the two primal powers, set one stalk aside, count off the heaps by fours to mirror the seasons, and gather the remainders. Run that whole procedure three times and you have one line; run it eighteen times and you have a hexagram.
A full stalk cast takes somewhere between twenty minutes and an hour, and it was clearly designed to slow the querent down. The ritual is meditative by construction — by the time the sixth line settles, the question has been held in mind, undistracted, for the better part of an hour. Many practitioners argue this focusing effect is not incidental to the method; it is the method.
The plant itself matters symbolically. Yarrow (蓍, Achillea millefolium, often called milfoil) was regarded in early China as a plant of exceptional longevity, and its straight, uniform dried stalks made it the natural instrument of sorts long before the I Ching commentaries canonized the procedure. When this site is named Yarrow, it is bowing to that original instrument.
The three-coin method: the practical shortcut
The coin method compresses the stalk ritual into six tosses. Take three matching coins, assign the inscribed side a value of 2 and the plain side a value of 3, toss them together, and sum: 6 is old yin, 7 is young yang, 8 is young yin, 9 is old yang. Six tosses, six lines, done in a minute.
Where did it come from? The coin method rose alongside the Najia (纳甲) style of analysis — the stem-and-branch system that underlies Liuyao — and is commonly linked in teaching lineages to the era of the Han-dynasty scholar Jing Fang (京房), whose school formalized Najia. That direct attribution is traditional rather than documented, so treat it as 待考 (attribution uncertain): clear textual evidence for coin casting is later, and what the historical record really shows is a gradual simplification of the stalk ritual for everyday consultation. What is not in doubt is the outcome: by the time Liuyao matured, three coins — classically brass cash with a square hole — had become its standard instrument, and they remain so today.
The trade the coin method makes is deliberate. It gives up the long ritual's meditative pacing in exchange for a cast simple enough to perform anywhere, for any concrete question, without special materials. Liuyao, the workhorse method for specific questions, inherited that practicality.
The probability difference, stated precisely
This is the one place the two methods genuinely, measurably diverge — and it is often misstated online, so here are the exact numbers.
- Three coins: old yin (6) = 1/8, young yang (7) = 3/8, young yin (8) = 3/8, old yang (9) = 1/8.
- Yarrow stalks: old yin (6) = 1/16, young yang (7) = 5/16, young yin (8) = 7/16, old yang (9) = 3/16.
Read those carefully and two facts stand out. First, the chance that a line moves at all is the same in both methods — 1/4 per line (2/8 with coins, 4/16 with stalks), so a cast produces roughly the same amount of change either way. Second, the direction of change differs: coins treat old yin and old yang symmetrically, while the stalk ritual produces old yang three times as often as old yin. The stalk method is biased toward yang transformation; the coin method is not.
Whether that asymmetry is a feature or a flaw has been debated for centuries. Some traditionalists hold that the stalks' tilt toward yang reflects the cosmology the ritual encodes, and that coins lose something real. Others point out that the symmetry of coins is arguably more faithful to the ideal of yin and yang in balance, and note that centuries of Liuyao practice on coin odds have produced a vast, coherent interpretive literature. There is no experiment that could settle the question, and honest treatments should say so.
Does it matter in practice?
The sincere-practice argument runs like this: divination works through the querent's focus and the ritual's gravity, so the method that demands more of you — the stalks — yields more. The statistical counterargument runs: if the oracle answers through the pattern, then any well-defined randomizer with known odds serves, and the coin method's millennium of practical use speaks for itself. Both positions have serious advocates, and the two methods have coexisted for centuries without either driving out the other.
A pragmatic consensus among many teachers: use stalks when the question deserves the long ritual — a life decision, an annual consultation, a moment where the slowing-down is itself the point. Use coins for the daily workhorse questions Liuyao was built for. And whichever you use, be consistent: mixing methods across casts of the same question makes the odds impossible to reason about.
What Yarrow uses, and why
Yarrow casts with the three-coin method — the standard instrument of Liuyao, the divination art this site is built around. Three coins, six tosses, lines built bottom-up, each line landing as 6, 7, 8, or 9 with the classical coin odds. The name honors the older stalk ritual; the engine honors the practical tradition that grew from it.
The coin method also has a quiet virtue for a digital tool: its probabilities are symmetric, well defined, and easy to implement faithfully. When you cast on the casting page, each virtual toss reproduces the exact 1/8-3/8-3/8-1/8 distribution of physical coins — no hidden weighting, no "improved" odds. The chart is computed by rule; the interpretation then cites its sources. If you want to understand what those 6, 7, 8, 9 values do next, read changing lines explained — or, if your cast comes back perfectly still, what a static hexagram means.
Frequently asked questions
Are yarrow stalks more accurate than coins?
There is no evidence either way. The measurable difference is statistical — stalks favor old yang, coins are symmetric — and both methods have centuries of accepted practice behind them.
What is the probability difference?
Coins: 1/8, 3/8, 3/8, 1/8 for 6, 7, 8, 9. Stalks: 1/16, 5/16, 7/16, 3/16. Both move a line one time in four; only the old-yin-versus-old-yang balance differs.
Which method is older?
The stalks, by far — the Xici zhuan describes the ritual. Coins are the later simplification that spread with Najia analysis; the tidy origin stories attached to them are traditional rather than documented.
Which method does Yarrow use?
The three-coin method of Liuyao, reproduced with faithful classical odds — three coins, six tosses, lines built from the bottom up.
Try the coin method yourself
The coin cast is the fastest way to feel what this guide describes: six tosses, a marked hexagram, and an interpretation that shows which lines moved and why it matters.