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In a tea passport, the “picking standard” line looks short: “single bud,” “bud and one leaf,” “bud and two leaves,” “picking by opened leaf.” It is not a poetic description and not a marketing note, but a technical characteristic of the raw material: which part of the shoot ended up in the batch. It determines the appearance of the dry leaf, how the raw material behaves in processing, yield per area, labor input, and ultimately price. At the same time, this line by itself is not a quality assessment — and that is perhaps the main thing to understand when reading it.

What exactly is picked: anatomy of the shoot

Tea picking is carried out not from the whole bush, but from young shoots — flushes. On a shoot, one distinguishes:

芽 (yá) — the bud, a not-yet-unfolded apical leaflet, covered with down (白毫, báihao) in many cultivars;
一叶, 二叶, 三叶 — the first, second, third unfolded leaves, counting down from the bud;
鱼叶 (yúyè) — “fish leaf,” a reduced lower leaflet at the base of the shoot, usually not counted as a full leaf;
对夹叶 (duìjiā yè) — a “pinched” shoot in which apical growth has stopped and the bud does not develop; in tender picking standards it is considered a raw material defect, but in oolong standards it is not (see below);
单片 (dānpiàn) — a single leaf without a bud and without a petiole.

These elements are what make up the picking standard formula. Additionally, the degree of leaf unfolding is recorded: 初展 (chūzhǎn) — the leaf has only begun to unfold, and 开展 (kāizhǎn) — the leaf is unfolded. Therefore, “一芽一叶初展” and “一芽一叶开展” are two different standards, even though the formula is the same.

Processing and sensory evaluation terminology is fixed in the general standards: 茶叶加工术语 (GB/T 40633-2021) and 茶叶感官审评术语 (GB/T 14487-2017), and the evaluation methodology is in 茶叶感官审评方法 (GB/T 23776-2018). According to GB/T 23776-2018, the appearance of dry tea is evaluated by five attributes: shape (形状), tenderness (嫩度), color (色泽), integrity of the leaves (整碎), and cleanliness (净度); the indicator 匀整度 — uniformity — refers there not to the dry leaf, but to the infused leaf (叶底). That is, raw material tenderness (嫩度, nèndù) is only one of five attributes of one of the evaluation blocks. A batch consisting only of buds, but with broken pieces and petioles, may score lower on the sum of attributes than a neatly made “bud and two leaves” batch.

The tenderness scale and why it works as a grade

The basic scale looks like this:

Formula	Pinyin	Meaning	Typical position in the grade
单芽	dān yá	only the bud, without leaves	the most tender, the most expensive in labor input
一芽一叶	yī yá yī yè	bud and one leaf	the highest grades of named green and black teas
一芽二叶	yī yá èr yè	bud and two leaves	the main working standard of many categories
一芽三叶	yī yá sān yè	bud and three leaves	middle grades, denser infusion, higher yield
一芽三四叶 and larger	—	bud and three to four leaves, shoots with coarsened leaf	mass raw material, pressed and dark teas

The logic is simple: the closer to the shoot tip, the younger the tissue. Young tissues differ biochemically from mature ones, and the lower down the shoot, the more fibrous and coarse the leaf becomes. Hence tender raw material gives a more delicate, “higher” profile, while more mature raw material gives a denser, more saturated, and often coarser one. For categories where delicacy and neat dry leaf shape are valued, the tenderness scale naturally turned into a commercial grade scale.

This is visible in the structure of standards for specific named teas. 信阳毛尖 (Xìnyáng máojiān, GB/T 22737-2008) describes six gradations — from 珍品 to 四级; 庐山云雾 (Lúshān yúnwù, GB/T 21003-2007) has four. For 滇红 in the group standard 滇红工夫红茶 (T/CTSS 38-2021), the upper grades are named directly by raw material and shape: 单芽级 (三金) and 特级 (松针).

For white tea, the picking scale has largely become the product names, but it is precisely here that one sees it is not universal. Under 白茶 (GB/T 22291-2017), 白毫银针 (báihao yínzhēn) is single buds, 白牡丹 (bái mǔdān) is a bud with one or two leaves, 寿眉 (shòuméi) is a larger and more mature shoot or leaf. And 贡眉 (gòngméi) falls out of this series: it is defined not by a tenderness step but by the bush cultivar — the raw material is only 群体种 (菜茶, the small-leaf “local” tea), and the tenderness gradation within it is set separately. That is, even where the picking scale became fixed in product names, one of the names stands on a different axis.

For black teas, the same logic applies. 金骏眉 (jīnjùnméi, industry standard GH/T 1118-2015) is built on picking buds from 桐木菜茶; gongfu black teas (工夫红茶, GB/T 13738.2-2017) have an expanded grade grid where raw material tenderness is one of the leading attributes; broken black tea (红碎茶, GB/T 13738.1-2017) by definition works with more mature and more technological raw material.

Where the scale breaks down even within greens

Even where tenderness is considered a virtue, “bud” is not universal.

六安瓜片 (Lù’ān guāpiàn, local standard DB34/T 237-2017) is picked as 单片无芽梗 — as individual leaves without a bud and without a petiole. The bud here is not raw material, but what is separated out.
太平猴魁 (Tàipíng hóukuí, GB/T 19698-2008) is made from the large leaf of the 柿大茶 cultivar, and the picking formula here is subordinated to the “orchid” shape rather than to miniature size.
恩施玉露 (Ēnshī yùlù, GB/T 35825-2018) — steam fixation and needle shape, where the picking standard determines the possibility of rolling into a needle.

That is, the scale works not in the abstract, but within a specific technology and a specific bush cultivar.

The inverted logic of oolongs: 开面采

For oolongs, the tenderness scale does not merely weaken — it reverses. The main approach is called 开面采 (kāimiàn cǎi) — “picking by opened leaf”: the shoot is plucked when apical growth has already stopped and the upper leaf has unfolded. The degree of openness is described by comparing the upper leaf with the second one:

Term	Pinyin	What it means
小开面	xiǎo kāimiàn	the upper leaf is noticeably smaller than the second
中开面	zhōng kāimiàn	the upper leaf is about half to two-thirds of the second
大开面	dà kāimiàn	the upper leaf is almost equal to the second, the shoot is most mature

The main difference from the green tea scale: in oolong logic, the bud does not raise the grade and is not the purpose of picking — the raw material is considered to be the opened shoot. But this does not mean the bud is declared defective. In GB/T 18745-2006 (武夷岩茶), the acceptable fresh raw material (合格的茶青) includes shoots of 开面采 with different degrees of opening of the second leaf, and 一芽四叶 — that is, a shoot with a bud, taken from a strong bush — and 对夹叶. In GB/T 30357.1-2013 (乌龙茶, part 1), a bud on a stopped shoot (驻芽) is directly included in the definition of oolong raw material. So 对夹叶, which in tender green standards is considered a defect, is normal raw material in oolongs, and a bud is simply a trait by which oolong is not evaluated.

The reasons why oolong technology is oriented toward the mature shoot are documented in our materials only as technological ones:

A strong petiole and dense leaf are needed for rolling — both for the knotted shape of southern Fujian and Taiwan and for the “strip” of Wuyishan and Chaozhou oolongs.
A mature shoot withstands the 做青 (zuòqīng) cycle — alternating withering and shaking (摇青, yáoqīng) with controlled damage to the leaf edge and partial oxidation — that is, it tolerates repeated mechanical load without breaking down.

Beyond this begins what we cannot confirm. The claim that oolong aroma precursors are connected specifically with mature leaf tissue, while an unopened bud gives grassiness and “dead” areas during 做青, is not supported by anything in our materials: we have no measurements for specific cultivars and leaf positions. Why a mature shoot gives oolong aromatics is a question of biochemistry, and here it remains open.

Formally, the basic requirements for oolong are set in 乌龙茶第1部分:基本要求 (GB/T 30357.1-2013), and for named teas — in separate parts: 铁观音 (.2), 黄金桂 (.3), 水仙 (.4), 肉桂 (.5), 单丛 (.6), 佛手 (.7), 白芽奇兰 (GB/T 30357.9-2020). The GI standard for Wuyi rock tea is 地理标志产品武夷岩茶 (GB/T 18745-2006). Taiwan-style oolong is described by a separate product standard — 台式乌龙茶 (GB/T 39563-2020); it is not a GI and does not set a geographical linkage. The technological regulation is 乌龙茶加工技术规范 (GB/T 35863-2018).

The practical consequence for reading a passport: for an oolong, the line “single bud” or “bud and one leaf” would be not a sign of a higher grade, but a signal that either the raw material was picked not according to oolong logic, or the description was written out of inertia from the green tea scale. A normal entry for an oolong is “中开面, shoot with two or three leaves” or simply an indication of 开面采. The specific number of leaves and degree of openness differ by region, cultivar, and product type, and no single figure exists for “all oolongs.”

Puer: the scale moves into maocha grade

In Yunnan, the scale “bud — bud and leaf — bud and two leaves” is also used at picking, but then it is translated into another system — the grade of 晒青毛茶 (shàiqīng máochá), sun-dried raw material. The GI standard for puer is 地理标志产品普洱茶 (GB/T 22111-2008), with the raw material being the Yunnan large-leaf subspecies (云南大叶种) in the form of 晒青.

Features because of which a direct transfer of the scale does not work:

The large-leaf cultivar gives a different shoot geometry. The “bud and two leaves” of Yunnan large-leaf is incomparable in mass and area with the “bud and two leaves” of a small-leaf cultivar from Zhejiang.
In sheng puer, tenderness is not the goal. The raw material must have “body” — sufficient structure and reserve of substances for long-term storage. An overly tender batch can give a beautiful young infusion and at the same time quickly “empty out.”
Finished raw material is sorted by tenderness already as maocha, and this grade becomes the input into the recipe. For shu puer, the scale looks like this: 宫廷 > 特级 > 一 > 三 > 五 > 七 > 九级 — from tender to coarse.
Raw material grade is embedded in the 唛号 (màihào) system, the recipe numbers of large factories, applied since 1976. In a four-digit number (five digits for loose tea), the first two digits are the year of the recipe, the third is the raw material class (the smaller, the more tender), and the fourth is the factory (1 — 昆明/中茶, 2 — 勐海/大益, 3 — 下关, 4 — 普洱). Thus, 7542 is a 1975 recipe, class 4 raw material, 勐海 factory; 7572 is the reference shu; 7581 is a 中茶 shu brick. At the same time, 唛号 denotes the recipe, not the year of production and not the storage characteristics.

A separate layer is phenotypes and niche raw material, which in a passport sometimes stand in place of the picking standard: 紫娟 (zǐjuān) — a selected cultivar with high anthocyanin content, 紫芽 (zǐyá) — a purple bud phenotype in old and wild trees, 芽苞 (yábāo) — “bud-cocoon,” small dense buds. These are characteristics of the cultivar or phenotype, not tenderness gradations, and comparing them with the 单芽/一芽一叶 scale directly is incorrect.

Picking standard, yield, and price

The link between picking standard and price is almost always mediated by labor input and product yield, not by taste directly.

The more tender the standard, the smaller the mass of one picked element and the more hand movements are needed per kilogram of raw material. A batch of single buds requires an incomparably larger number of plucks than the same mass of “bud and three leaves.”
Fresh leaf loses a significant portion of its mass during processing; for tender raw material, the yield of finished tea per unit of picked fresh leaf is lower because the bud has a high share of water and a small share of structural tissue. Specific coefficients differ by category and technology and are not a universal quantity.
Tender standards almost always mean hand picking. Machine picking does not distinguish a bud from a third leaf and gives a cut of the whole shoot — therefore machine raw material by definition falls into coarser gradations, and its sorting is carried out after picking.
A narrow picking standard shortens the picking window: the shoot remains in the needed phase for only a short time, and a smaller share of the harvest is picked per pass over the plantation.
Early-season picks are additionally more expensive because of small volume and high demand, and descriptions often mix two different traits — season and picking standard. These are different axes.

The reverse side: a more mature standard gives higher yield, lower cost, and in a number of categories — more technologically appropriate raw material. Cheaper does not mean worse for its task. Pressed and dark teas, as well as broken black tea (红碎茶), work on raw material that scores low on the tenderness scale and at the same time matches its purpose.

Jasmine tea does not fit into this series, although it is often put there. In 茉莉花茶 (GB/T 22292-2017), the tea base (花茶坯) undergoes 窨制 (yìnzhì) — repeated saturation with fresh flowers — and the base can be of any tenderness: the upper steps of the grade scale in the standard are named directly by bud raw material — 大白毫, 毛尖, 毛峰, 银毫, then 春毫, 香毫, and only after that 特级, 一级 and below. Premium jasmine teas are made from selected downy buds. The key criterion for the base here is not maturity and not cheapness, but the ability to take up and hold aroma during 窨制.

Why the picking standard does not equal quality

The line “single bud” communicates three things about the raw material: that it was hand-picked, that it is tender, and that it cost a lot in labor. It does not communicate whether the tea is tasty.

The main reasons why comparing teas by this one line does not work:

Different bush cultivars. Small-leaf and large-leaf varieties give shoots of different size and different biochemistry. An early pick of a small-leaf cultivar and a late pick of a large-leaf cultivar are two incomparable quantities, even if the picking formula is written identically. It also happens that the bush cultivar directly replaces the tenderness scale in defining a product — as with 贡眉, which under GB/T 22291-2017 is made only from 群体种.
Different technologies. For green and white tea, tenderness is a resource; for oolong, it is not the trait by which raw material is evaluated; for sheng puer, it is a matter of storage strategy. The same raw material in different technologies will occupy different positions in the grade.
The picking standard is not the only grade attribute. In sensory evaluation under GB/T 23776-2018, tenderness enters the appearance block along with shape, color, integrity of the leaves, and cleanliness, and then infusion, aroma, taste, and infused leaf are evaluated.
Declared and actual. The formula in a description is the target standard. A real batch almost always contains an admixture of neighboring gradations; how close it is to the declared one is shown by the infused leaf, not by the line in the passport.
Terroir, altitude, plant age, season, roast, and storage affect the result no less, and in a number of categories more strongly, than the tenderness gradation.

The practical way to read a passport is to take the picking standard not separately, but in a bundle: category and technology → bush cultivar → region and altitude → season → picking standard. Outside this bundle, the line “一芽一叶” decides nothing.

What this article does not claim

No numerical grade boundaries are given here — percentages of buds, masses, norms of finished tea yield from fresh leaf, yield per area. Such indicators are set by specific standards and internal manufacturer specifications, differ by category and region, and giving them “in general form” would be unreliable.
It is not claimed that the scale 单芽 / 一芽一叶 / 一芽二叶 / 一芽三叶 is officially fixed as a single normative gradation for all tea categories. This is a working production scale that enters different standards in different ways; there is no universal national “picking standard” with such a scale for all six classes.
No biochemical mechanism is claimed for the connection between leaf maturity and oolong aromatics. We have no data on aroma precursors depending on leaf position, and this we cannot confirm.
Standard names and numbers are given according to our working GB/T summary (see the standards registry). The content of their texts is quoted selectively — where a conclusion is built on it (the composition of appearance attributes in GB/T 23776-2018, the composition of acceptable 茶青 in GB/T 18745-2006, the grade axis of GB/T 22292-2017, the definition of 贡眉 in GB/T 22291-2017). For some named teas no profile national standard exists — for example, 祁门红茶 has no GB/T GI; the current profile document is the industry standard GH/T 1178-2019.
For 大红袍, the status of a separate part of the oolong standard (GB/T 30357.8) is marked in our summary as requiring clarification; it is not asserted here as current.
Exact picking formulas for specific regions, cultivars, and farms are not given: the numbers of leaves, degree of openness, and tolerances differ, and we do not have verified summary data for every named tea.
The biochemical part is given qualitatively. Claims about “which leaf contains more” of particular compounds require references to measurements for specific cultivars and seasons; without them, any figures would be invention.
The histories of individual productions, names of masters and farms are not described: we have no verifiable sources on them.
Evaluative ratios such as “more tender means more expensive” are true as a tendency, but not as a rule: price is also determined by raw material scarcity, the reputation of the region, plant age, and the year, and specific price proportions are not established here.

Brief summary

采摘标准 is a technical record of which part of the shoot ended up in the batch, not a taste assessment.
The scale 单芽 → 一芽三叶 works as a grade where technology values tenderness: greens, whites, gongfu blacks, as well as raw material grade in shu puer. But even within white tea it is not continuous: 贡眉 under GB/T 22291-2017 is defined by the bush cultivar (only 群体种/菜茶), not by a tenderness step.
For oolongs, the opposite logic of 开面采 operates: the opened mature shoot is picked, the bud does not raise the grade and is not the purpose of picking — while a shoot with a bud (一芽四叶) and 对夹叶 are directly classified by the 武夷岩茶 standard as acceptable raw material, meaning this is not a defect, but a different evaluation axis.
For puer, the scale transitions into the grade of 晒青毛茶 and further into the recipe system of 唛号, where the third digit indicates the raw material class.
Low tenderness is appropriate for pressed, dark, and broken black teas, but is not a rule for jasmine tea: in GB/T 22292-2017, the upper grades are named by bud raw material.
Comparing teas by a single picking standard line is meaningless without specifying the bush cultivar, region, season, and technology.

the teas described here are available from teamotea