Matcha looks simple in your bowl. Bright green powder, water, foam. The journey it took to get there is anything but. Most quality matcha is the product of about six weeks of careful agricultural work followed by hours of slow grinding. Here's the full chain — useful background for anyone trying to understand why a 30g tin runs $40.
Step 1: Shading
Three to four weeks before harvest, tea farmers cover the bushes with bamboo screens, canvas, or modern mesh, cutting sunlight by 70 to 90 percent. The plant responds by producing more chlorophyll (intensifying the leaf's green color) and more amino acids — particularly L-theanine, which the plant uses as a nitrogen storage compound when photosynthesis slows.
The exact shading time is one of the most important quality variables. Longer shading produces more umami and sweetness but reduces yield. Top-tier matcha farms shade for the full 4 to 6 weeks; mid-range farms 2 to 3 weeks; culinary-grade matcha leaves are sometimes shaded for only a week or skipped altogether.
Step 2: Harvest
First-flush leaves — picked in late April through mid-May in most Japanese tea regions — are the most prized. They're tender, sweet, and at peak amino acid concentration. The youngest leaves at the tip of each branch (the bud and the next two leaves) are picked by hand for ceremonial-grade; mechanical harvesters are used for culinary-grade.
A skilled hand-picker harvests 5 to 10 kilograms of fresh leaf per day. Most of that weight evaporates in the next steps; you end up with about a fifth of the original mass as finished matcha.
Step 3: Steaming
Within hours of picking, the leaves are steamed for 15 to 30 seconds. Steaming halts oxidation — the same chemical reaction that turns black tea black. By stopping it immediately, the leaves keep their bright green color and the chlorophyll, catechins, and amino acids built up under shade.
This is what makes matcha (and other Japanese green teas) different from Chinese green teas, which are typically pan-fired instead of steamed. Steam-fixing produces a sweeter, more vegetal character; pan-firing produces a more roasted, nutty profile.
Step 4: Drying and de-stemming
After steaming, the leaves are dried slowly in special tencha-dryers — temperature-controlled chambers that bring the moisture content down without scorching the leaf. This step takes twenty minutes to several hours depending on the dryer.
Dried, the leaves are then sorted to remove stems and veins. What's left — the soft, dried leaf flesh only — is called tencha. Tencha is technically usable as a tea on its own (steeped like a delicate green tea), but its real destiny is the stone mill.
Step 5: Stone milling
Tencha is loaded into ishi-usu, traditional granite stone mills. Two large discs rotate against each other at very low RPM, slowly grinding the dried leaf into fine powder. The slow speed prevents heat — heat would scorch the leaves and dull the green color and flavor.
A traditional ishi-usu produces only 30 to 40 grams of matcha per hour. A single mill, running all day, can produce less than a kilogram. This is the bottleneck that defines matcha pricing more than any other step. Modern producers also use ceramic mills and electric grinders, which are faster but generally considered to produce less nuanced matcha.
Step 6: Sealed packaging
Finished matcha is immediately packed in airtight, opaque tins, often nitrogen-flushed to displace oxygen. From mill to sealed tin should take hours — exposure to air starts oxidation, and quality matcha is shipped to retailers and customers in their original sealed tins.
From shaded bush to packed tin takes about six weeks. The slow steps — shading, drying, milling — are where quality is made or lost. This is also why proper matcha is expensive, and why anything cheap labeled "ceremonial" is almost always something else.