What Counts as White Tea? An ISO Standard Decides

White tea is about to get its first dedicated international standard. On 6 October 2026, ISO/FDIS 20680 White tea — Definition and basic requirements entered the final ballot, the last formal vote before publication. ISO lists an eight-week ballot, putting a result in early December.

The draft does not reinvent white tea. It draws the boundary of the word: which plant parts may be used, which processing methods count, what chemical requirements indicate good manufacturing practice, and how the tea is packed and stored.

From a Technical Report to a Full Standard

Since 2013 the reference has been ISO/TR 12591, a six-page technical report defining white tea by plant source and production methods; it was confirmed in 2020 and remains current. ISO 20715:2023, which sorts tea into six types, drew its white tea definition from it.

ISO 20680 changes the status rather than the substance: a technical report is informational, while an International Standard is normative — a document trade and inspection can be measured against. It sits under ISO/TC 34/SC 8, the tea subcommittee.

What the Draft Covers—and What It Leaves Out

Two things follow. The chemical requirements indicate good manufacturing practice — a production-integrity check, not a quality score. And because scented, flavoured and decaffeinated teas are excluded, a jasmine-scented white tea sits outside the scope.

Why Shou Mei Sits at the Centre of the Definition

The key detail is raw material. The 2013 definition, carried into ISO 20715, described white tea as made from the bud, or the bud and one to three tender leaves. Leaf-only material was not clearly inside that boundary.

ISO 20680's final text is unpublished. But ISO/TS 5617:2025 cites clause 3.1 of ISO 20680 and records that it modified the wording. In that citation, white tea comes from the bud, or the bud and tender leaves, or the leaves only — leaf-only identified as Shou Mei, bud-and-leaf as Bai Mu Dan, bud-only as Bai Hao Yin Zhen. It also notes that products of different origins following the process count.

If wording along those lines survives the ballot, it settles a long-running question: whether white tea made from mature leaf, with no bud in the pluck, is really white tea. It would also restate the principle that white tea is defined by processing, not geography.

What Has Not Been Decided

The draft is still in ballot, and an FDIS ballot can send a document back to committee. The final text is not public, so no limits or grading clauses can be quoted. ISO standards are voluntary; national adoption is a separate decision. Above all, it draws a category boundary, not a verdict on whether a tea is good.

Our View: A Definition Sets the Boundary, Not the Benchmark

We sell white tea from two very different places: Fuding in Fujian, and Yunnan. Both are made the same minimal way — wither and dry, no enzyme inactivation, no rolling — and both qualify under any of these definitions. They do not taste alike, for reasons no standard captures: cultivar, elevation, harvest window, drying. We wrote about that gap in our comparison of Fuding white tea against other origins.

So we welcome Shou Mei being written into a definition: it gives the most affordable grade a clear identity. But “counts as white tea” is a category claim, not a quality claim. Plucking standard, season and storage still decide the cup — which is why the grades from Silver Needle to Shou Mei and our Shou Mei guide remain the more useful map.