Okumidori (おくみどり): The Cultivar That Earns Its Reputation Quietly

Every now and then when I am trying to understand why a particular matcha works as well as it does, I end up looking at the cultivar and finding Okumidori in the blend. That is how I first started paying close attention to this cultivar. Our Sen Matcha uses Okumidori as a component, and the reason is not complicated: it contributes exactly what a well-structured blend needs, rich color, clean umami, and a rounded sweetness that does not fight with anything else in the cup. The more I looked into it, the more I found it: in Uji, in Kagoshima, in Mie as kabusecha, in Fukuoka as gyokuro.

That ubiquity is the point. For anyone building a working knowledge of Japanese tea cultivars, Okumidori is one of the first you should understand precisely because it is everywhere: in single-cultivar teas, anchoring blends, defining the premium output of entire growing regions. A cultivar that performs well across nearly every application and prefecture while maintaining a genuinely pleasing cup is not ordinary. It is quietly excellent.

Okumidori おくみどり 奥みどり is a Japanese tea cultivar registered in 1974, bred from Yabukita 藪北 (やぶきた) as the flower parent and Shizuoka Zairai No. 16 静岡在来16号 (しずおかざいらい16ごう) as the pollen parent. It was developed at Japan's national tea research station in Kanaya, Shizuoka, now part of NARO's Institute of Fruit Tree and Tea Science, and registered as Tea Norin No. 32 茶農林32号. According to the 2020 MAFF survey, it accounts for approximately 3.3% of Japan's cultivated tea area, placing it fourth nationally behind Yabukita, Yutakamidori, and Saemidori. In Kyoto Prefecture, one of Japan's most important centers of premium shaded-tea production, it is the second-most planted cultivar at approximately 12% of the prefecture's tea area.¹

Okumidori is a late-budding cultivar: its sprouting period begins approximately 11 days after Yabukita, and its harvest window opens around 8 days after Yabukita.² It is grown primarily in Kagoshima, Mie, and Kyoto Prefecture (Uji and Wazuka), with additional plantings in Aichi, Fukuoka, and Saga.³ Originally registered for sencha production, it has become an increasingly important cultivar for tencha 碾茶 (てんちゃ, the shade-processed leaf ground into matcha) and gyokuro 玉露 (ぎょくろ) as well.

In the cup, Okumidori produces rich umami with low astringency and a vivid deep green color. Japanese institutional sources describe it as refreshing, clean, and without particular defects or exaggerated individual character.² Its color depth and post-milling stability make it a valued blending component for matcha producers who need stronger visual intensity without compromising flavor.

The name combines two elements. 奥 (oku) carries the sense of "inner," "deep," or "late," and in tea cultivation vocabulary often signals a late-maturing cultivar.² みどり (midori) means green. Deep green, late green. Both meanings are literal: the leaves are notably dark, and the cultivar arrives at harvest a week after much of the industry's main crop is already in.

Okumidori was bred at the national tea research station in Kanaya, Shizuoka, by crossing Yabukita as the flower parent with Shizuoka Zairai No. 16 as the pollen parent. It was registered in 1974 as Tea Norin No. 32 (茶農林32号), with the former strain designation 茶本F1-NN29.⁴

The crossbreeding began in 1953. After years of trial cultivation and regional adaptation testing across multiple prefectures, the cultivar was formally submitted as a high-yield late-budding sencha candidate in February 1974 and received its registration in June of that year.²

Registration did not mean immediate adoption. Through most of the 1970s and into the 1980s, Okumidori remained lightly planted. The reason was structural: late-budding cultivars were priced lower at tea auctions because the market benchmarked on first-flush Yabukita, and anything arriving later was treated as lower-priority. Even a technically capable cultivar could not command the premiums that would make large-scale planting worthwhile.

That changed from around 1990, for two reasons that had little to do with flavor.

The first was farm scale. Tea farms in Kagoshima and Miyazaki were expanding rapidly, and Yabukita alone could not cover the full harvest window efficiently. A farm with more land than its labor and equipment can handle simultaneously needs cultivars that mature at different times, so teams and machines can move through fields in sequence. Okumidori's eight-day harvest offset from Yabukita was a practical answer to a real operational problem.² The ichibancha 一番茶 (いちばんちゃ, first flush) window is extremely compressed; an extra week of processing time when a factory is at capacity is genuinely significant.

The second was the rapid growth of the ready-to-drink bottled green tea market, which created demand for high-yield cultivars capable of consistent large-volume output. Okumidori's yield, comparable to Yabukita's, made it attractive for that supply chain.² Okumidori's sprouts also harden slowly after peak picking point, and its cold hardiness makes it particularly valuable in mountainous areas and frost-prone regions.²

Those forces drove cultivated area expansion through the 1990s and 2000s. The more consequential development came later, when premium tencha producers in Uji and Nishio discovered what Okumidori could do under shade.

The flavor profile as sencha is mellow and well-balanced: umami is noticeable, astringency mild, bitterness restrained. Japanese institutional sources describe it as 欠点やくせがなく、使いやすい品種, a cultivar without defects or peculiarities, easy to work with.² In blending, that evenness is a genuine asset: it brings body and color without pulling a blend in an unwanted direction.

Under shade, theanine content rises substantially. The plant's catechin production slows under reduced light while amino acid levels remain elevated, a function of reduced photosynthesis. Theanine is one of the main amino acids associated with umami and sweetness in shade-grown teas, and Okumidori is recognized by specialist producers as a cultivar with strong theanine response under shade. The resulting tencha and matcha shows rich sweetness, deep umami, and very low astringency.

Okumidori naturally produces leaves of notably deep, saturated green, described in Japanese institutional sources as 濃緑色 (nouryokushoku).² Under shade, chlorophyll content increases further, and the resulting tencha and matcha hold a vivid, intense green that premium producers value. A vivid deep green in the bowl can signal high chlorophyll content, reflecting shading quality and leaf freshness, and for tea ceremony practitioners and premium buyers, color is a legible quality indicator.

There is a processing caveat worth knowing. When Okumidori is processed as aracha 荒茶 (あらちゃ, the unfinished crude leaf produced at the farm), the stems tend to appear whiter than usual against the dark leaf, which looks irregular at auction. The World Green Tea Association's source notes that harvesting a few days before peak maturity reduces this.² For tencha, where leaves are destemmed and deveined during finishing, it is less relevant.

Beyond its own color, Okumidori is used by matcha blenders specifically to improve the visual appearance of a blend, lending a more vivid green to the powder. I have written about this practice in more depth in the Japanese Tea-pedia article on chlorophyll in matcha.⁵ Chlorophyll intensity and umami depth do not always move together: Saemidori さみどり, prized for rich umami and sweetness, can have a lighter leaf color depending on growing and processing conditions. A blender needing both may combine Okumidori's color contribution with another cultivar's flavor character.

The main centers of cultivation are Kagoshima Prefecture, Mie Prefecture, and the Kyoto region, particularly Uji and Wazuka.

Kagoshima adopted Okumidori largely through the harvest-window logic above. It is now Japan's leading tencha-producing prefecture, with 2,150 tonnes produced in 2024, confirmed by the Kagoshima Prefectural Tea Growers Association.⁶ Okumidori's high yield and cold hardiness suit the prefecture's flat, mechanized growing conditions well.

Uji and Wazuka select cultivars by quality rather than volume. Okumidori's tencha color and theanine profile under shade made it a natural fit. In Kyoto Prefecture overall, it holds approximately 12% of cultivated tea area, second only to Yabukita.¹ Mie grows it primarily for kabusecha 被覆茶 (かぶせちゃ), and Fukuoka's Yame region values it specifically for gyokuro, where the World Green Tea Association's source identifies it as highly regarded.²

Tencha, the raw material for matcha, is typically shaded for around 20 days or more before harvest under high light-blockage conditions. The shade shifts the leaf toward high theanine and elevated chlorophyll. After harvest the leaf is steamed, dried without rolling, then destemmed and deveined before stone-milling. Stone mills 茶臼 (ちゃうす) produce approximately 40 grams per hour per millstone pair.⁷

Gyokuro 玉露 uses a comparable shading duration and intensity. What distinguishes it from tencha is the processing after harvest: gyokuro leaves are rolled after steaming and dried as a leaf tea rather than ground. Both styles suit Okumidori well; its mellow character becomes more concentrated and expressive as theanine accumulates under shade.

Kabusecha uses lighter shading of around seven to ten days before harvest, lifting theanine enough to add softness and sweetness without the full amino-acid accumulation of longer shade periods. Okumidori kabusecha reads noticeably sweeter than the unshaded sencha version.²

In the cultivar landscape, Okumidori does not have the individual distinction of Saemidori's vivid brightness or the ceremonial heritage of Asahi and Gokou in the Uji tradition. What it has is consistency and genuine versatility, performing well as both shaded and unshaded tea, in both powder and leaf form, across multiple regions with different soils and climates, a combination that is relatively uncommon.

Its approximately 3.3% national share understates how present it is in the teas people actually drink. Its concentration in premium tencha-producing areas means it appears disproportionately in high-value products, and in Kyoto's tea fields it holds 12% of planted area.¹ When you encounter a premium single-cultivar Uji matcha labeled Okumidori, or an Okumidori gyokuro from Yame, you are drinking a tea that arrived at that position through genuine agricultural merit and a structural story that played out across three decades of Japanese tea farming. That is what quiet excellence looks like when you trace it back.