Uji starts shading the bushes
The practice that separates Japanese green tea from every other green tea in the world: covering the field for weeks before picking. It is the origin of matcha's colour and of gyokuro's sweetness, and it began as protection rather than as a flavour decision.
From around the sixteenth century
Within this century. Placed within the century with confidence. A narrower date would be invented.
Attribution to a specific decade or grower is not supportable. What is clear is that Uji is the district where the practice is developed and refined, and that it is well established by the Edo period.
TeaHQ synthesis. TeaHQ's own reading of well-attested general knowledge, with no single source behind it.
The version that circulates
That shading was invented to improve flavour, or that it was invented to produce matcha.
What the evidence carries. That the earliest rationale is generally given as protection — from frost and from direct sun on the new growth — and that the flavour and colour consequences were then recognised and pursued deliberately. Matcha predates shading by centuries; shaded matcha is the later and now the standard form.
What happened
Growers covered the bushes with straw, reed screens and later synthetic mesh for two to four weeks before the harvest, cutting the light reaching the leaf sharply. The plant responds by keeping the leaf greener and softer than it otherwise would be. The covered leaf is the raw material for tencha, and tencha ground is matcha.
Why it matters
It is the single most consequential agronomic decision in Japanese tea. Shading is why matcha is that green, why gyokuro tastes the way it does, and why the Japanese green profile diverged from the Chinese one — and it is a cultivation choice rather than a processing one, which is unusual for a difference this large.
Connected events
- Returned from China c. 1191; wrote Kissa Yōjōki in the early thirteenth century — Eisai, and what he actually did
- The technique matures across the Edo period and is mechanised in the twentieth century — Tencha, the stone mill, and why matcha is expensive
What this touches
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.