How matcha is made: why shade, harvest, and the stone mill decide the cup

Ask how matcha is made and the honest answer is that most of what you taste was decided months before the powder reached a tin — in a shaded field and a slow stone mill. A fine green powder looks like a single thing; it is really the last stage of a five-step chain, and each link changes the cup. Get the chain right and the matcha stays vivid green through milk, disperses cleanly on a busy bar, and repeats season after season; skip a step to cut cost and it shows up as a khaki, gritty, bitter drink your customer never orders twice.

This guide walks the making of matcha — shade-growing, harvest, steaming, de-veining into tencha, and stone-milling — and ties each step to what a café buys on: colour that survives milk, powder that suspends fast, and lots that stay consistent across deliveries. We source these lots grower-direct in Japan, so it is written from the supply side, not the shelf.

What is matcha, exactly?

Matcha is whole green tea leaf, shade-grown and milled to a fine powder — and that definition sets it apart from every other tea. Ordinary green tea is steeped and thrown away; you drink an extract. With matcha you whisk the entire leaf into the liquid and drink all of it, which is why it carries so much more colour, body, and flavour per cup, and why it must be milled almost impossibly fine. That single fact drives everything downstream: the leaf's quality cannot hide behind brewing, so the whole chain serves two truths — grow a leaf worth drinking whole, then mill it fine enough to drink.

Why is the leaf shaded before harvest?

The first true matcha-making step happens in the field. For roughly the last three to four weeks before harvest, the tea plants are covered — shade-grown under cloth or reed screens that cut most of the direct sunlight. This is the step that most separates matcha from ordinary powdered green tea, and it changes the leaf in three ways a buyer can see and taste.

• More chlorophyll — the colour that survives milk. Starved of full sun, the leaf produces extra chlorophyll to catch what light it can, deepening to a vivid green. That is the pigment that stays green when the matcha is whisked through milk instead of fading to khaki — the single most visible marker of a properly shaded lot in a latte.
• More L-theanine — the umami. Shading slows the conversion of the leaf's amino acids, so more L-theanine remains. That is the savoury, almost brothy sweetness that defines a good matcha and rounds off the edges of a milk drink.
• Fewer harsh catechins — less bitterness. Less direct sun means the leaf develops fewer of the catechins that read as sharp, astringent bitterness, so a well-shaded matcha tastes smooth rather than green-and-grassy.

Longer, more careful shading costs the grower time and yield — one reason a ceremonial-style grade sits where it does on price. When a matcha holds its colour through a cappuccino and tastes savoury rather than bitter, you are reading the shading step. If a lot turns khaki the moment it hits steamed milk, no barista technique saves it: pouring a lot through milk is the test the shading step passes or fails.

Why does the harvest decide the grade?

When the leaf is picked matters almost as much as how it was grown. The finest matcha comes from the first harvest (ichibancha) — the year's opening flush of new spring growth, the tenderest and most flavour-dense leaf the plant produces. For the top grades that flush is hand-picked, taking only the softest new leaves — slow, labour-heavy work that a single spring window allows.

Tender first-harvest leaf grinds to a finer, cleaner powder and carries more umami; later harvests give a coarser leaf that reads greener and more astringent. This is the main lever behind the grade ladder: a first-harvest, hand-picked, heavily shaded lot becomes a ceremonial-style grade, while a slightly later machine-harvested pick — still shade-grown, still carefully made — becomes a workhorse latte grade that pours at volume for less. It is a difference of use, not of care, which is why the ceremonial-versus-culinary split is better read as a use question than a quality one.

How does the leaf become tencha?

Freshly picked leaf is not matcha, nor even ready to mill. Two steps turn it into tencha, the flaky dried leaf that matcha is ground from.

First, steaming. Within hours of picking, the leaf is steamed for seconds — the step that makes Japanese green tea Japanese. The heat halts oxidation almost instantly, locking in the green colour and fresh, vegetal character. Chinese green teas are more often pan-fired for a toastier, roasted profile, one of the real reasons Japanese and Chinese green powders look and taste so different in a cup.

Then the leaf is dried flat, without rolling, and the stems and tough central vein are stripped out, leaving only the soft leaf flesh. That de-veined flake is tencha. The de-veining step is invisible in a tin and decisive in the cup: vein and stem are fibrous and hard, never grinding as fine as leaf flesh, so any left in the mix ends up as grit that will not stay suspended. A clean, de-veined tencha is what lets the final powder disperse cleanly instead of clumping and settling.

Why is matcha stone-milled so slowly?

The final step is the one the word "matcha" literally describes — grinding tencha into powder — and where solubility is decided. The traditional method is a granite stone mill, whose defining feature is how slowly it turns: a single mill produces only about 30 to 40 g an hour. That slowness is the point. It yields an exceptionally fine, even particle with minimal heat, and both properties matter directly on a bar.

• Fine, even particles wet and suspend fast. More surface area for their weight means they wet almost instantly and stay suspended longer before gravity pulls them down — a matcha that whisks smooth in seconds and holds its green rather than gritting out at the bottom.
• Low heat protects colour and aroma. Grinding fast heats the powder, dulling the very colour and fresh aroma the shading was grown for and leaving a coarser, uneven grind that clumps. Slow stone-milling keeps it cool and even.

Fineness is not only a stone-mill privilege, though. MATSU's premium grades are stone-milled; the everyday latte grades are precision machine-milled to a spec that preserves the same dispersion at café volume — so you are not paying stone-mill prices on a workhorse latte grade just to get one that suspends cleanly on a Saturday rush.

How do Uji, Kagoshima, and Izumo differ?

The five-step chain is the same wherever matcha is made in Japan. What shifts between regions is the climate, cultivar, and scale behind each step — and that is what moves the flavour and the price. MATSU sources across three:

• Uji (Kyoto) — the benchmark. The historic heart of matcha and the reference most buyers price against — deep umami, a refined finish, the profile people picture when they picture ceremonial matcha.
• Kagoshima (southern Kyushu) — the value workhorse. A warm southern climate means earlier harvests and larger, well-organised production, making it the reliable, vivid, high-volume choice for a café latte programme that needs quality at scale for less.
• Izumo (Shimane) — the rare reserve. A smaller, less common growing area that yields MATSU's top reserve grade — the scarcer end of the ladder, with a distinctive single-origin story.

Because harvest timing, shading, and milling cost differently across these origins, region is one of the clearest signals of where a grade sits on price. The table below maps the making onto the ladder — a three-region subset; the full eight-grade range is in the catalogue.

The full ladder runs eight grades from $390 to $1,050 per kilogram, and the right one depends on how you serve rather than on prestige — see the whole architecture on the grades explained guide, or let the grade diagnostic narrow it to your use and volume.

Why does producer-direct change what you can know?

Everything above is easy to write and hard to verify — unless you can see the chain. A generic tin tells you nothing about how long the leaf was shaded, whether it was first-harvest, or whether it was milled cool and slow or hot and fast — the exact variables that decide the cup, and ones a broker several steps from the field usually cannot answer either. That is the case for buying it the way MATSU sells it: grower-level sourcing through MATSU, without the usual chain of trading houses, importers, and distributors between the field and your bar. Because we source the lots directly, the lot you taste is milled from the same de-veined leaf by the same people season after season — which keeps colour and solubility stable across deliveries, so a $6 drink cannot suddenly clump or fade because a distributor swapped in a coarser lot. When a first-harvest lot runs short, we say so and move you to a tasted alternative rather than substitute quietly; consistency is managed, not promised as a law of nature.

The MATSU Tasting Kit is $129 and ships three flagship grades — Uji Signature, Kagoshima Premium, and Uji Classic — at 3 × 30 g, delivery included, so you can watch how the making lands in your cup — colour through milk, speed of suspension, how the umami reads. The $129 is credited in full to a first order of 1 kg or more, so once you commit, the test cost nothing. A single producer-direct order runs up to roughly 30 kg. When you are ready, request the professional catalogue for full specs, milling, and pricing across all eight grades.

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