Matcha: Japan’s Stone-Ground Green Tea, Production Centers, and How to Experience It
Matcha — finely stone-ground powder of specially grown and processed green tea leaves — has become one of the world’s most recognized Japanese food products, used in tea ceremony, confectionery, ice cream, and contemporary beverages globally. But the matcha exported and mass-produced for flavoring applications differs fundamentally from the high-grade ceremonial matcha produced in Japan’s premium tea regions and consumed in the tea ceremony. Understanding how genuine matcha is grown, processed, and graded transforms an encounter with the product from passive consumption into active engagement with one of Japan’s most sophisticated agricultural crafts.
How Matcha is Produced
Matcha begins with tencha — tea leaves grown under shade cover for three to four weeks before harvest, a process called oishita saibai (shading cultivation). The shade covering (traditionally rice straw, now typically black synthetic netting) reduces photosynthesis, causing the plant to produce more chlorophyll (deepening the green color), more amino acids (particularly L-theanine, which contributes sweetness and the relaxed alertness matcha drinkers report), and less catechin tannins (reducing bitterness). The result is a leaf fundamentally different in chemistry and flavor from unshaded sencha.
After harvest, the leaves are steamed to prevent oxidation, dried, and then sorted to remove stems and veins — the remaining pure leaf material is tencha. Tencha is then stone-ground at extremely slow speed (a single granite millstone pair produces approximately 40 grams per hour) to produce the fine powder that is matcha. The slow grinding prevents heat buildup that would alter the powder’s chemistry; genuine stone-ground matcha retains the amino acids and chlorophyll that fast mechanical grinding degrades.
Uji: Japan’s Premier Matcha Region
Uji, a small city between Kyoto and Nara, has been producing Japan’s finest tea for over 800 years. The city’s position between the Uji River and surrounding hills creates a microclimate — morning mist from the river providing natural humidity, the hills sheltering from wind — that suits high-quality tea cultivation. Uji’s tencha and matcha production supplies the major tea houses (Ippodo, Marukyu Koyamaen, Uji Yamashiro) whose products are used in formal tea ceremony.
The Uji tea district’s walkable historic area includes several tea producer facilities open to visitors: Marukyu Koyamaen’s tea garden and mill, the Taihoan public tea house on the Uji River, and multiple tea shop tastings along the approach to Byodoin Temple. The annual Uji Tea Festival (October) celebrates the harvest with ceremonial tea presentations at Uji Shrine. Uji is accessible in 20–30 minutes from both Kyoto and Nara by train.
Nishio: Aichi Prefecture’s Matcha Region
Nishio in Aichi Prefecture produces approximately 20% of Japan’s matcha, competing with Uji in volume while developing its own regional character. The Nishio tea fields — flat, intensively cultivated plains rather than Uji’s hillside terraces — suit mechanized cultivation; Nishio matcha is particularly associated with the food ingredient market (matcha confectionery, matcha ice cream, matcha beverages). The Nishio City Matcha Museum offers production demonstrations and tastings; the region’s intensive use of traditional reed-mat shading (yoshizu*) produces a characteristic sweetness that Nishio producers emphasize.
Grading and Tasting Matcha
Matcha grades range from ceremonial (highest) through premium, culinary, and ingredient grades. The indicators of quality: deep green color (a vivid chlorophyll green rather than olive or yellow-green); fine, non-clumping texture; sweet, umami-forward flavor with minimal bitterness; and a distinctive fresh-grass fragrance. Poor-quality or oxidized matcha turns dull yellow-green and develops bitterness. Side-by-side tasting of a ceremonial-grade Uji matcha and a commodity culinary-grade product — available at the major tea houses’ tasting counters — makes the quality difference immediately comprehensible.
Purchasing matcha at source in Uji, from producers like Nakamura Tokichi or Itoh Kyuemon, ensures freshness and provenance; both offer tea tastings alongside retail. Matcha should be stored in an airtight container away from light and used within two months of opening for optimal flavor.