Tencha, the stone mill, and why matcha is expensive
Matcha is not ground green tea. It is a specific leaf, grown under shade, dried without rolling, stripped of stem and vein, and milled on granite slowly enough that the powder does not cook.
The technique matures across the Edo period and is mechanised in the twentieth century
A process, not a moment. This happened over a period rather than on a date, and the span is the honest answer.
TeaHQ synthesis. TeaHQ's own reading of well-attested general knowledge, with no single source behind it.
The version that circulates
That matcha is simply powdered green tea, or that any green tea ground finely enough becomes matcha.
What the evidence carries. That matcha is defined by its raw material and its milling as much as by being a powder. Ground sencha is a real product, is sold, and is not matcha: it is rolled leaf, unshaded or lightly shaded, with stem included, usually milled fast in a metal grinder. The colour, texture and taste all differ, and so does the price.
What happened
Shaded leaf is steamed, then dried without any rolling — the step that defines every other Japanese green tea is deliberately omitted, which is what leaves the leaf brittle and flat. Stems and veins are separated out, leaving tencha: the leaf blade alone. Tencha is then milled between granite wheels turning slowly, historically by hand and now by motor, producing a few tens of grams an hour.
Why it matters
It is the whole answer to why matcha costs what it does, and to why cheap matcha is a different product rather than a worse batch of the same one. The shading costs a harvest's yield, the de-stemming discards material, and the milling rate is a hard physical limit — a stone mill cannot be run faster without heating the powder and destroying the colour and aroma.
Connected events
- Roughly the tenth to thirteenth centuries — Whisked powdered tea and the Song tea competitions
- From around the sixteenth century — Uji starts shading the bushes
- From the 2000s, with acute supply pressure from the mid-2020s — The matcha boom, and the shortage it produced
What this touches
Producing countries
Processing steps
Teaware
Compiled from published sources by people who are not historians of this region or period. Where accounts conflict the disagreement is reported rather than settled.