How Matcha Is Made: From Tea Field to Powder
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Matcha is made through a six-stage process: shading the tea plants, hand-harvesting the youngest leaves, steaming them immediately after picking, air-drying them flat, removing stems and veins to produce a material called tencha, and finally stone-grinding that tencha into the fine powder you whisk into your cup.
No stage is incidental. Skip the shading and you lose the chlorophyll intensity and the L-theanine that makes matcha energy feel different from coffee. Rush the grinding and you get heat damage that dulls the color and strips the flavor. The process is slow by design — and that deliberateness is exactly what separates a quality matcha from a cheap green powder wearing the same name.
The full journey takes the better part of a year, from pruning and soil preparation through to milling, packaging, and shipping to the USA.
Stage 1: Shade-Growing — Where the Flavour Is Built
Why is matcha shade-grown before harvest?
Matcha farmers cover their tea plants — typically with traditional tana frames draped in dark cloth or straw — for three to four weeks before picking. The shading blocks roughly 85–90% of direct sunlight.
A plant that can no longer photosynthesize efficiently does something interesting: it dials up chlorophyll production in an attempt to capture whatever light it can. At the same time, the amino acid L-theanine, which normally converts into catechins in the presence of sunlight, stays elevated. Less sun means less conversion — so more L-theanine stays intact in the leaf.
These two changes are the entire reason matcha tastes and functions the way it does. The chlorophyll gives it that vivid, almost electric green color. The L-theanine is what creates the smooth, sustained focus that matcha drinkers in the US describe as "calm energy" — the quality that separates a well-made matcha from a jittery espresso.
Think of it like this: shading is not just a farming step, it is a flavor-engineering decision made weeks before anyone touches the leaf.
How long are matcha plants shaded?
The standard shading period is 20–30 days for premium and ceremonial grades. Some high-end producers extend this to 35 days for an even more intense umami profile and deeper green. Shorter shading periods — sometimes used for culinary-grade production — produce leaves with less L-theanine and a noticeably less vivid color.
The timing also matters within the growing season. Most premium matcha in Japan is made from the first flush — the season's earliest growth, harvested in spring (April–May). First-flush leaves are the youngest, most tender, and highest in L-theanine. Later harvests (second flush, third flush) produce leaves used for culinary grade and lower-priced products.
Stage 2: Harvesting — Only the Best Leaves Make It
Which leaves are used to make matcha?
Only the youngest, most tender leaves at the very top of the plant — typically two to three leaves per shoot — are selected for premium matcha production. These are the leaves that developed entirely under the shading canopy and have the highest chlorophyll and L-theanine concentration.
Older leaves further down the branch contain more tannins and fewer amino acids. They produce more astringency and bitterness — characteristics that work fine in culinary-grade matcha but are unwanted in ceremonial grade.
Traditional high-quality matcha is still hand-harvested (tencha picking). Skilled pickers select individual shoots by feel and familiarity with the plant — a judgment that machine harvesting cannot reliably replicate at the same quality level. Mechanical harvesting exists for volume production but introduces more stem material and less-selective leaf collection.
What happens immediately after picking?
Speed matters enormously here. Tea leaves begin oxidising within minutes of being separated from the plant — the same biochemical process that turns a cut avocado brown. Left unchecked, oxidation would convert the chlorophyll and catechins into compounds that produce an earthy, brown, less nutritionally active product.
The solution is to stop the oxidation immediately. In Japan's matcha production regions — Uji (Kyoto), Nishio (Aichi), and Yame (Fukuoka) being the most prominent — leaves move from field to steaming facility within hours of harvest, often the same day.
Stage 3: Steaming — Locking In the Green
How does steaming affect matcha quality?
Freshly harvested leaves are passed through a steamer at around 212°F (100°C) for 15–30 seconds. This brief, intense heat exposure deactivates the enzymes responsible for oxidation. The process is called fixing or kill-green (kamairi or mushisei in Japanese processing terminology).
Japanese tea production — including all authentic matcha — uses steaming to fix the leaf. This is what creates the characteristic bright green color and fresh, vegetal flavor that distinguishes Japanese green teas from Chinese green teas, which are typically pan-fired. Pan-firing produces more toasty, nutty notes; steaming preserves the grassy, marine, umami quality that matcha is known for.
The steaming window is extremely narrow. Under-steam and oxidation enzymes survive — the leaf continues to brown. Over-steam and you cook the leaf, destroying the delicate amino acids and producing a dull, cooked-vegetable flavor. Experienced producers manage this by adjusting steam duration in real time based on leaf moisture content and ambient temperature.
Stage 4: Drying and Sorting — From Leaf to Aracha
What is aracha in matcha production?
After steaming, the leaves are dried in a two-stage process. First, they are cooled and dried with forced air to remove surface moisture. Then they pass through a drying chamber that reduces water content to around 5% — low enough for stable storage and processing.
The dried but unprocessed material at this point is called aracha (荒茶) — literally "rough tea" or "crude tea." Aracha contains not just the leaf blade itself but also stems, veins, and petioles (the small stalks connecting individual leaves to the branch).
For most other green teas, aracha at this stage would be rolled into needles and packaged. Matcha production does neither. It goes to sorting.
Why are stems and veins removed for matcha?
Stems and leaf veins contain concentrated levels of tannins and a coarser fibre structure. Including them in the final powder would introduce unwanted astringency, a grittier texture, and a less uniform particle size after milling. They are removed mechanically — a process that separates the flat, blade-only portions of the leaf from all supporting structures.
What remains after de-stemming and de-veining is tencha (碾茶) — the flat, unrolled, pure leaf blade. Tencha is the direct precursor to matcha. It is the material that goes into the stone mill.
This sorting step is one of the clearest quality checkpoints in the entire process. Higher-grade tencha contains less stem residue, more uniform leaf pieces, and a brighter, more consistent color. The quality of the tencha determines the ceiling of the matcha it will become — no amount of careful milling fixes poor-quality input material.
Stage 5: The Stone Mill — Where Tencha Becomes Matcha
How is matcha powder made from tencha?
Tencha is fed in small amounts into a traditional granite stone mill (石臼, ishiusu). Two circular granite stones sit one on top of the other. The upper stone rotates slowly — typically under 30 revolutions per minute — while the lower stone remains fixed. Tencha fed through the centre aperture is ground progressively finer as it works its way outward toward the edges, where it falls as powder.
The resulting powder is approximately 5–10 microns in particle size — roughly one-tenth the width of a human hair, and finer than most pharmaceutical powders. This extreme fineness is what allows matcha to suspend in hot water rather than sinking to the bottom.
Why does milling speed matter so much?
This is the step most commercially produced matcha cuts corners on. Faster milling — using ball mills or industrial grinders — is dramatically more efficient per hour. A single stone mill produces only 30–40 grams per hour. An industrial roller mill produces kilograms.
But speed generates heat, and heat is the enemy of everything that makes matcha worth drinking. At elevated temperatures:
- Chlorophyll degrades, shifting the color from vivid green toward yellow-olive
- L-theanine and other amino acids partially denature
- Volatile aromatic compounds — responsible for matcha's fresh, grassy scent — evaporate
Stone milling at low speed keeps the grinding surface cool. Some high-end producers refrigerate the milling chamber or operate at night when ambient temperatures are lower. The result is a powder that retains full color, full flavor, and full nutritional integrity.
A single stone mill grinding 30–40 grams per hour means that a 30-gram tin of ceremonial-grade matcha represents approximately one full hour of a single mill's production. That is not a romantic detail — it is the direct reason premium matcha costs what it does, and why the price gap between a quality tin and a budget one reflects a genuine difference in process, not just marketing.
→ "A 30-gram tin of ceremonial-grade matcha represents roughly one hour of a single stone mill's production."
Stage 6: Sifting, Packaging, and Freshness
What happens to matcha after it is milled?
Freshly milled matcha passes through a fine-mesh sieve to break up any remaining clumps and ensure consistent particle size across the batch. This sifted powder is immediately transferred to airtight, light-blocking packaging — typically sealed tin containers.
This is not incidental. Matcha begins degrading the moment it contacts oxygen, light, and moisture. The compounds that make it green, flavorful, and functional — chlorophyll, L-theanine, catechins — all begin oxidizing at room temperature in open air. A well-produced matcha that is poorly stored will taste mediocre within weeks.
Freshness indicators to look for when buying matcha in the US:
- Harvest date or production date printed on the tin (not just a vague "best by" date)
- Opaque, sealed tin or foil pouch — never clear packaging
- Vivid green powder when opened, not olive, yellow, or brown
- Clean, grassy, slightly sweet scent — not earthy, musty, or hay-like
→ "How Much Matcha Powder for One Cup? Ratios Explained" [Publishing soon]
The Full Process at a Glance
Here is the complete matcha production process from field to finished powder:
| Stage | What Happens | Why It Matters |
|---|---|---|
| 1. Shading | Plants covered for 20–30 days before harvest | Boosts chlorophyll and L-theanine; builds flavor depth |
| 2. Harvesting | Youngest top leaves hand-picked, first flush only | Ensures highest amino acid concentration and delicate flavor |
| 3. Steaming | Leaves steamed at 212°F (100°C) for 15–30 sec | Stops oxidation; locks in green color and fresh character |
| 4. Drying | Forced-air and chamber drying to ~5% moisture | Stabilizes the leaf for processing and storage |
| 5. Sorting (aracha → tencha) | Stems and veins mechanically removed | Eliminates astringency; produces pure flat leaf blade |
| 6. Stone milling | Tencha ground at <30 RPM on granite stone mill | Produces ultra-fine 5–10 micron powder without heat damage |
| 7. Sifting & packaging | Sieved and sealed in airtight, opaque tins | Preserves freshness; prevents oxidation and flavor loss |
Why the Origin Region Still Matters
Matcha production is concentrated in three primary regions in Japan — Uji in Kyoto, Nishio in Aichi Prefecture, and Yame in Fukuoka. Each region produces slightly different flavor profiles based on soil mineral content, altitude, and local growing traditions.
Uji (Kyoto): Japan's most historically significant matcha-growing region. Uji matcha is associated with complex umami, a silky mouthfeel, and a reputation for ceremonial use. Prices tend to be the highest.
Nishio (Aichi): Japan's highest-volume matcha production region — responsible for the majority of matcha exported to the US. Nishio matcha is known for consistency and a clean, balanced flavor profile. Most specialty loose leaf matcha available in the US is Nishio-sourced.
Yame (Fukuoka): A smaller, less widely exported region with a reputation for exceptionally sweet, low-bitterness matcha. Harder to find in the US but worth seeking for drinkers who prefer a sweeter, more delicate profile.
For US buyers, seeing a named origin region on the label — rather than just "Product of Japan" — is a meaningful quality signal. It indicates the producer knows their sourcing chain well enough to name it.
→ "How Matcha Powder Is Made — And Why Grade Matters".
What the Process Means for What's in Your Cup
Understanding how matcha is made explains almost every question people have about drinking it.
Why is good matcha so green?
Because shade-growing forces maximum chlorophyll production, and stone milling at low temperatures preserves it. A dull, olive-coloured powder signals either poor-quality input leaves, sun-exposed growing conditions, industrial milling with heat damage, or age.
Why does matcha taste different from brewed green tea?
Because you are consuming the entire ground leaf — not just the water extract. Every amino acid, every antioxidant, every milligram of chlorophyll that the shade-growing process produced is in your cup. Brewed green tea extracts a fraction of this through water contact and discards the rest.
Why does matcha cost more than other green teas?
Stone milling at 30–40 grams per hour. Hand-harvesting first-flush leaves only. Removing stems and veins individually. Shading infrastructure maintained for weeks before each harvest. None of these steps are cheap, fast, or automated at the quality level. The price reflects the labor and time built into every gram.
At Oasis Teaz, Zenful Matcha Green Tea is sourced as a small-batch, artisan-grade loose leaf product — stone-ground and handpicked at origin — for everyday drinkers who want the real production story in their cup.
→ Shop Zenful Matcha Green Tea
→ Browse All Green Teas
→ "Matcha Green Tea: The Complete Guide (2026)"
Frequently Asked Questions
How is matcha made differently from regular green tea?
Both start from the same Camellia sinensis plant, but matcha undergoes shade-growing before harvest to increase chlorophyll and L-theanine. After steaming and drying, stems and veins are removed to produce tencha, which is then stone-ground into a fine powder. Regular green tea is rolled into leaves and steeped — only the water extract is consumed, not the whole leaf.
What is tencha, and why does it matter?
Tencha is the de-stemmed, de-veined, flat dried leaf produced after steaming and sorting — the direct precursor to matcha powder. Only tencha goes into the stone mill. Its quality — leaf age, shading duration, stem content — determines the ceiling of the matcha it produces. No milling technique can compensate for low-quality tencha input.
Why is matcha stone-ground instead of machine-ground?
Stone milling at under 30 RPM generates almost no heat. This preserves the chlorophyll, L-theanine, and volatile aromatic compounds that give matcha its colour, flavour, and functional properties. Industrial grinding is faster but generates heat that degrades all three. The slow speed is not tradition for tradition's sake — it is the only process that delivers the particle fineness and quality intact.
Why is shade-growing important for matcha?
Shading blocks 85–90% of sunlight for 20–30 days before harvest. Without sun, the plant cannot convert L-theanine into catechins through photosynthesis — so L-theanine stays elevated in the leaf. Simultaneously, the plant ramps up chlorophyll production to capture the limited available light. These two changes directly produce matcha's intense green colour and its characteristic calm, focused energy profile.
Does where matcha comes from affect its quality?
Yes, meaningfully. Japan's three primary matcha regions — Uji (Kyoto), Nishio (Aichi), and Yame (Fukuoka) — each produce distinct flavour profiles based on soil, altitude, and local growing practice. Uji is most associated with ceremonial complexity; Nishio produces most of the consistent, clean matcha exported to the US; Yame is known for unusual sweetness and low bitterness. Named origin on the label is a reliable quality signal for US buyers.
How long does the matcha production process take?
The full process — from the start of shading to packaged powder — takes roughly 4–6 weeks from shading onset. The growing season itself (soil preparation, pruning, and plant maintenance) spans the full year. High-quality ceremonial-grade matcha is produced once a year from the first-flush spring harvest, typically April–May in Japan. Later harvests produce culinary-grade material.