Pu-erh Cultivars: Assamica, Local Populations and Leaf Grade

Pu-erh is made from the large-leaf Assamica variety, and the finished tea is sold under GB/T 22111, which fixes the product rather than the cultivar. and the finished tea is sold under GB/T 22111, which fixes the product rather than the cultivar, so a cake that cites it has made a claim about process and origin rather than about leaf size. and within that variety there are dozens of local populations with different leaf sizes, aromas and aging behaviour. The named cultivars used in plantations are a small modern subset; the old gardens are unselected populations, and the difference shows in the leaf at 7 g per 100 ml: a plantation leaf gives up its contents faster and flattens sooner across infusions. the old gardens are unselected populations that vary from tree to tree. Leaf grade, from tips down to coarse leaf, is a separate axis.

The two axes are often confused on a label. A cake described as old-tree and a cake described as high grade are making claims about different things, and the standard cake is 357 g, so a claim that doubles the price per gram has to be justified by something other than the shape. and the price gap between them is large: a standard cake is 357 g, so a claim that doubles the price per gram has to be justified by something other than the shape. and a buyer who reads one as the other will misjudge the price.

The variety and its populations

Camellia sinensis var. assamica is the large-leaf variety, distinguished from the small-leaf var. sinensis of eastern China by leaf size, leaf thickness and a higher polyphenol content. Almost all pu-erh is Assamica.

Within Assamica, Yunnan has many local populations named after places: Menghai large leaf, Mengku large leaf, Jinggu, Jingmai. They differ in leaf shape, in the ratio of catechins to amino acids and in how they age.

Those populations are not cultivars in the agricultural sense. They are landraces, grown from seed and variable, and a garden of them is a mixed population rather than a uniform crop.

Modern plantations use selected clones: Yunkang 10, Yunxuan 14 and several others bred for yield and uniformity. They are productive and they lack the variation that makes the old gardens interesting.

Leaf grade, which is a different axis

Leaf grade describes which part of the shoot went into the cake. A high grade is bud-heavy and gives a sweet, aromatic, fast-aging tea. A low grade is coarse and gives a strong, slow-aging one.

Most cakes are a blend of grades, because a garden produces all of them and a producer uses the whole harvest. A cake made from a single grade is a deliberate choice and it is sold as such.

The number system used on some cakes, 1 to 9, is a grade reference and it is applied loosely. A 1 is the finest and a 9 is the coarsest, and the numbers are not standardised across producers.

A buyer should therefore treat a grade number as a rough indication and a grade name as a marketing term. Neither replaces looking at the leaf.

What the label usually means

A cake labelled old tree is making a claim about the plant and its age. A cake labelled high grade is making a claim about the picking. A cake labelled both is claiming both, and the two claims are independent.

The most informative labels name the village and the year, and say nothing about grade or tree age. That is because the village implies a population and a picking habit, and the year implies the weather.

A drinker comparing two cakes should therefore compare them on one axis at a time. Two cakes of the same village and different years show the weather; two of the same year and different villages show the place.

That is a slower way to learn than reading labels, and it is the only way that produces knowledge rather than vocabulary.

Why the populations differ

Yunnan’s tea populations evolved in isolated valleys, and each valley selected for slightly different traits over centuries. The Menghai population is vigorous and high-yielding with a strong bitterness; the Mengku population is slower and sweeter.

Growers propagated the best trees by seed within a valley, which preserved the local character without fixing it. The result is a population rather than a clone, and the variation is the point.

Modern clonal selection replaced that with uniformity. A clone yields predictably and it cannot reproduce the range that makes a forest garden interesting.

Both systems produce good tea. The difference is that a population gives a range across a garden and a clone gives the same cup across a county.

• Populations evolved in isolated valleys.
• Each valley selected for different traits.
• Growers propagated by seed within a valley.
• The result is a population, not a clone.
• Clones give uniformity, populations give range.
• Both systems produce good tea.

How to read a grade claim

A cake described as single grade is claiming that the leaf was sorted before pressing. That is expensive and unusual, and the cake will look uniform.

A cake described as blended is making no claim about grade and is the norm. Most cakes blend because a garden produces all grades and a producer uses the whole harvest.

A cake described as bud-heavy is claiming a high proportion of tips, which gives a sweet and fast-aging tea. It is a real claim and it is visible in the leaf.

The grade number, where it appears, is a rough reference. A buyer should look at the leaf and treat the number as a hint rather than a specification.

• Assamica is the large-leaf variety used for pu-erh.
• Yunnan has many landrace populations named after places.
• Plantation clones are bred for yield and uniformity.
• Leaf grade is a separate axis from tree age.
• Most cakes blend several grades.
• The grade number is a loose reference, not a standard.

A final note on the difference between a population and a clone in the cup. A population gives a range across a garden and a clone gives the same cup across a county.

Neither is better in the abstract. A drinker who wants consistency buys a plantation tea; one who wants range buys a forest garden tea, and both are making a legitimate choice.

What is not legitimate is using the vocabulary of one to sell the other, which is what most of the label confusion amounts to.

What a landrace means in practice

A landrace is a population that has been selected by farmers over generations without being fixed into a uniform variety. Every tree is slightly different, and the differences are inherited.

That is why two cakes from the same village and year can taste different. The leaf came from different trees within a population that is not uniform, and the blend inside each cake differed.

A producer working with a landrace has a choice: blend the trees for consistency, or select the best trees and sell them separately. The second is what produces the single-tree cakes at the top of the market.

Both are legitimate. The blend is the traditional product and the single tree is the modern premium one, and the price difference reflects selection rather than species.

• A landrace is a population, selected but not fixed.
• Every tree differs slightly and the differences are inherited.
• Two cakes from one village can differ for that reason.
• Producers blend for consistency or select for premium.
• Single-tree cakes are a modern premium product.
• The price difference reflects selection, not species.

The clone question

A clone is a vegetatively propagated single genotype, which means every bush in a plantation of Yunkang 10 is genetically identical. That gives a predictable yield and a uniform cup.

It also gives a vulnerability. A population spreads its risk across many genotypes; a clone spreads it not at all, and a disease that affects one bush affects the field.

The trade-off is the same one that appears in every agricultural crop, and the tea market’s preference for old gardens is partly a preference for the older system rather than for a better cup.

A drinker should know that the preference exists and should judge the tea rather than the system. A well-made clonal tea is a good tea and it is simply not the same tea.

A last practical note on how a buyer can work with these labels. Ask three questions: which village, which year, and whether the leaf was sorted or blended.

The answers describe the population, the weather and the picking, which between them explain most of what a cake will taste like. The grade number and the tree-age claim add less and are harder to verify.

A producer who can answer all three is selling a specific product. One who answers only with a grade or a tree age is selling a vocabulary, and the price should be read accordingly.

That is the whole of the cultivar question: one species, dozens of populations, a modern set of clones, and a grade system that describes the picking rather than the plant.

Frequently asked questions