What is Plum Blossom numerology?
Plum Blossom Numerology — Mei Hua Yi Shu (梅花易數) — is a method of casting an I Ching hexagram without using coins, yarrow stalks, or any randomising tool. Instead, you take numbers from the present moment (year, month, day, hour, or any specific count in front of you), apply a fixed mathematical procedure, and derive the upper trigram, lower trigram, and changing line directly. The result is the same kind of hexagram you'd build with the coin method — but the casting is arithmetic, not chance.
The method's premise is philosophical: the moment of asking is itself meaningful, and the numbers embedded in the moment carry the same divinatory weight as a randomised throw. This puts Plum Blossom in a different family from the better-known coin and yarrow methods. Where those use chance to surface a pattern, Mei Hua argues that the pattern is already present in the numbers of the moment — you only have to read them.
How a Plum Blossom cast works
The standard method begins with three numbers: the year, the month, and the day of the question. Sum them, divide by 8, take the remainder. The remainder maps to one of the eight base trigrams (Qian, Dui, Li, Zhen, Xun, Kan, Gen, Kun) using Shao Yong's numbered ordering. That trigram becomes the upper trigram of the hexagram.
Add the hour to the original sum and divide by 8 again — this remainder gives you the lower trigram. Stack the two and you have a six-line hexagram, one of the 64 in the I Ching.
For the changing line, divide that same year+month+day+hour total by 6. The remainder (1 through 6, counting from the bottom) tells you which line in the hexagram is moving. Flip that line — yin to yang, yang to yin — and you have a second hexagram. The first is read as the present situation; the second is read as the direction the situation is moving in.
That is the full procedure. No randomisation. No equipment. Just numbers, a few divisions, and the standard I Ching text — though the philosophical lift is significant: you are asserting that the moment is already shaped, and your job is to read the shape, not to call it down.
Shao Yong and the historical method
The method is attributed to Shao Yong (邵雍, 1011-1077), a Northern Song dynasty Neo-Confucian philosopher who developed one of the most ambitious numerological cosmologies in the Chinese tradition. His major work, the Huangji Jingshi (Supreme Principles Governing the World), treats numbers as the structural skeleton beneath phenomena — every event, period, and being can be located in a numerical pattern. The Mei Hua method is the divinatory application of this larger system: if numbers structure reality, then a moment's numbers will encode its meaning.
The traditional origin story — Shao Yong watching sparrows fight on a plum tree branch, the branch breaking, predicting from the moment that a girl would break her thigh that evening picking plums — is almost certainly apocryphal. The handbook that bears Shao Yong's name was compiled by later students and editors. But the method itself is genuinely Song-dynasty, genuinely numerological, and has been in continuous use among Chinese diviners for nearly a thousand years.
Mei Hua sits in a different lineage from the older yarrow-stalk method (which the Zhouyi specifies and Confucius is recorded using) and the medieval three-coin method that became dominant in popular use. It is one of several casting methods that Chinese tradition treats as legitimately equivalent — the hexagrams produced are no less authoritative than those produced by chance.
How to use this oracle
Hold a question in mind before you cast. The Mei Hua method is sensitive to specificity — "what is the underlying shape of my career situation?" gives the hexagram more to bite into than "tell me my future". The numbers will derive themselves from the moment of asking; your job is to ask in good faith.
Press cast. The widget pulls the current date and time, runs the divisions described above, and shows you both hexagrams — the present situation hexagram and the resulting hexagram after the changing line flips — along with the standard I Ching commentary for each. Read the present-situation hexagram first; read the resulting hexagram as the direction the situation is moving in if no force intervenes.
For deeper work, look at the changing line specifically. That line is the active edge of the situation — the point where the present is converting into the future. The Yi-Jing's text for that specific line position usually contains the most actionable advice in the reading. Compare it against your own sense of where the friction is and the friction often shows up exactly where the line says it should.
Frequently asked questions
How is Plum Blossom different from coin-toss I Ching?
Coin-toss and yarrow-stalk methods use a randomising act — three coins thrown six times, or a fifty-stalk sorting ritual — to build a hexagram line by line. Plum Blossom doesn't randomise. It takes numbers (the current date, time, the count of objects in front of you, the number of strokes in a name) and divides them by 8 and 6 to derive the upper trigram, lower trigram, and changing line directly. The result is the same kind of hexagram — but the casting method is arithmetic, not chance.
Was this method really developed by Shao Yong?
Yes. Shao Yong (1011-1077) was a Northern Song dynasty Confucian philosopher and Yi-Jing scholar who developed an elaborate numerological cosmology — his Huangji Jingshi treats numbers as the underlying structure of all phenomena. Mei Hua Yi Shu (literally 'Plum Blossom Number Method') is traditionally attributed to him, though the surviving handbook bearing his name was compiled later from his teachings and his students' notes. The system is genuinely Song-dynasty in origin.
Why is it called 'Plum Blossom'?
The traditional story has Shao Yong observing two sparrows fighting on a plum tree branch — the branch broke and one bird fell. He cast a numerological hexagram from the moment to predict that a young woman would break her thigh that evening picking plums. The story is almost certainly apocryphal but the name stuck. The 'plum blossom' marks the genre of casting a hexagram from any incidental moment rather than a formal ritual.
Does the method actually predict the future?
Like all I Ching casting methods, it does not predict specific future events in any way that can survive controlled testing. What it does is give you a structured symbolic frame — the hexagram, the trigram pair, the changing line — for thinking about a present moment or question. Whether that frame is useful is a different question from whether it's predictive, and we recommend treating it as the former.
Why use numbers from the date and time?
The Mei Hua method's premise is that the moment of asking is itself meaningful — that the numbers contained in the moment (year, month, day, hour) carry the same divinatory weight as a randomised coin throw. Philosophically this aligns with the Yi-Jing's broader claim that situations are unitary, that the question and the answer are part of the same patterned moment. Practically, it means you don't need any tools — your watch is enough.
Round out the reading
Plum Blossom gives you a hexagram from the moment. For deeper context on the 64 hexagrams themselves, the I Ching guide is the reference. For an alternative casting method — three coins, six throws — the I Ching reading page handles it.