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Freshly picked bright green Japanese tea leaves piled in a traditional woven bamboo basket, ready for steaming and processing

Tea Culture | May 04, 2026 | A. Nakamura

How Japanese Green Tea Is Made in 6 Steps: From Leaf to Cup

Have you ever wondered how Japanese green tea is made? Unlike Chinese green tea, which is pan-fired, Japanese green tea undergoes a unique steaming process that halts oxidation within seconds of harvest — preserving the leaf's bright green color, vegetal flavor, and up to 30% more catechins. From spring harvest in the tea fields of Shizuoka and Uji to the final cup in your hands, Japanese green tea production follows six precise steps refined over centuries. This guide from Senbird Tea walks you through every stage, from cultivation and shading to the finished loose leaf tea in your teacup.

Rows of neatly trimmed Japanese green tea bushes with dark kabuse shade covers stretched over the plants, lush green hillside and trees in the background

Step 1: Cultivation and Shading (Year-Round)

Japanese green tea production begins long before harvest. Tea plants (Camellia sinensis var. sinensis) are carefully cultivated year-round, with the cultivation method directly shaping the final tea type.

Sun-grown teas like sencha and bancha grow in full sunlight. Photosynthesis converts L-theanine (an amino acid) into catechins (antioxidants), producing teas with a balanced, refreshing flavor and mild astringency.

Premium teas like gyokuro, matcha, and kabusecha are shaded for 14–30 days before harvest using canopy structures called tana or direct covers called jikagise. Shading blocks 70–90% of sunlight, preventing L-theanine-to-catechin conversion. The result is teas with intense umami, deep sweetness, higher caffeine, and a distinctive rich flavor.

Growing Method	Shade Duration	Tea Types	Flavor Impact
Full Sun	None	Sencha, Bancha, Hojicha base	Refreshing, balanced, catechin-rich
Partial Shade	7–14 days	Kabusecha	Enhanced sweetness, mild umami
Full Shade	20–30 days	Gyokuro, Tencha (matcha base)	Intense umami, deep sweetness

A tea farmer carrying a large woven basket walks through vibrant green tea rows toward a mechanical harvesting machine in a Japanese tea field

Step 2: Harvest (April–October)

Japan's tea harvest follows a seasonal rhythm that directly affects quality and price.

The first flush (ichibancha) in April and May is the most prized harvest. Leaves have accumulated amino acids during winter dormancy, producing the sweetest, most complex flavors. First-flush tea, called shincha when sold fresh, commands the highest prices and is eagerly anticipated by tea enthusiasts each spring.

The second flush (nibancha) in June and July produces stronger, more astringent leaves with higher catechin content — good everyday drinking quality.

The third flush (sanbancha) in August is more robust, often used for hojicha (roasted tea) or lower-grade sencha.

The autumn flush (yonbancha or akibancha) in October is the final harvest, typically used for bancha and hojicha production.

Harvesting is done by machine for most commercial tea using specially designed hedging machines that ride over the rows, while competition-grade and premium teas are still hand-picked (tezumi) by experienced workers who select only the bud and top two leaves.

Interior of a Japanese tea processing factory with large industrial steaming, rolling, and drying machinery lining a long corridor

Step 3: Steaming (Seconds After Harvest)

This is the defining step that makes Japanese green tea unique. Within hours of harvest (ideally within 12–20 hours), fresh leaves are steamed to halt enzymatic oxidation. This is what keeps the leaves green — without steaming, they would oxidize and become oolong or black tea.

The steaming duration determines the tea style:

Steaming Style	Duration	Result	Tea Type
Light Steam (Asamushi)	20–30 seconds	Needle-shaped leaves, clear liquor, delicate flavor	Traditional sencha
Medium Steam (Chumushi)	40–60 seconds	Balanced, most common	Standard sencha
Deep Steam (Fukamushi)	60–120 seconds	Broken leaves, cloudy liquor, rich umami	Fukamushi sencha

Deep steaming (fukamushi), developed in Shizuoka in the 1960s, breaks down leaf cell walls more thoroughly. This produces a richer, more full-bodied cup with less astringency and a deeper green color, though the leaves are more fragmented. Senbird Tea's Sencha Hatsuzumi is available in both traditional and deep-steamed styles to suit different taste preferences.

A hand holding a clump of dark, tightly rolled wet green tea leaves next to processing machinery in a small-batch Japanese tea facility

Step 4: Rolling and Shaping (30–45 Minutes)

After steaming, leaves go through a series of rolling stages that serve two purposes: shaping the leaves into their characteristic needle form and breaking cell walls to release the tea's flavor compounds.

During primary rolling (sojū), leaves are tumbled in a heated drum to reduce moisture while beginning the rolling process. Temperature is carefully controlled to prevent scorching.

In secondary rolling (jūnen), leaves are pressed and rolled under controlled pressure, further squeezing out moisture and compacting the cellular structure. This step develops the leaf's characteristic shape.

The final rolling (seijū) applies firm, directional pressure that rolls leaves into tight, needle-like shapes. Well-rolled sencha leaves are dark green, glossy needles approximately 1–2 cm long. This tight shape locks in flavor and aroma until brewing.

For matcha production, the process diverges after steaming: tencha leaves skip the rolling stage entirely. Instead, they are dried flat, de-stemmed and de-veined, then ground into the fine powder we know as matcha using granite stone mills that turn slowly (producing only 30–40 grams per hour) to prevent heat damage.

Fresh green Camellia sinensis tea leaves spread across large round bamboo trays for outdoor air drying in a Japanese tea farm setting

Step 5: Drying (20–30 Minutes)

Rolled leaves are dried in specialized dryers that reduce moisture content from about 30% to approximately 5%. This low moisture content is critical for shelf stability — tea stored at 5% moisture can maintain quality for 6–12 months when properly sealed.

At this stage, the tea is called aracha (荒茶) — crude or unrefined tea. Aracha contains stems, veins, and broken pieces that will be sorted out in the final refining step. Some tea enthusiasts specifically seek out aracha for its rustic, robust character.

Two men inspecting handfuls of processed green tea leaves inside a Japanese tea processing facility, checking quality and texture near industrial equipment

Step 6: Refining and Sorting (Shiage)

The final production step transforms aracha into finished tea through several processes.

During sorting, machines separate leaves by size and weight, removing stems (kuki), dust (demacha), and broken pieces. The removed stems become kukicha (stem tea), and the dust becomes konacha (the fine-ground tea served at sushi restaurants).

Firing (hi-ire) is a final, gentle heating step at 80–100°C that enhances aroma and removes any remaining moisture. The intensity of this firing varies by region — Sayama tea is known for its distinctive bold firing, while Uji tea typically receives lighter treatment.

Master tea blenders (gogumi) then combine leaves from different fields, harvests, and cultivars to create consistent flavor profiles. This blending art ensures that a tea brand's signature taste remains consistent year after year.

Overhead view of a wooden tray with five small dishes holding different varieties of Japanese loose leaf tea including sencha, hojicha, gyokuro, and genmaicha, with a brewed cup of green tea in the center

How Different Japanese Teas Diverge in Production

While all Japanese green teas share the same steaming foundation, each variety takes a unique path during processing that defines its final character. Genmaicha, for example, blends standard green tea with roasted rice for a nutty, toasty flavor, while hojicha undergoes roasting at 200°C after standard processing to develop its brown color and low caffeine content.

Tea	Unique Processing Step	Result
Sencha	Standard steam + roll	Classic Japanese green tea
Gyokuro	20+ days shade before harvest	Intense umami, sweetness
Matcha	Shade-grown, de-stemmed, stone-ground	Fine powder, whole-leaf consumption
Hojicha	Roasted at 200°C after standard processing	Brown color, toasty, low caffeine
Genmaicha	Blended with roasted rice	Nutty, toasty, budget-friendly
Kukicha	Made from stems sorted out during refining	Mild, sweet, very low caffeine
Kamairicha	Pan-fired instead of steamed	Light, floral, Chinese-influenced

How is Japanese green tea different from Chinese green tea?

The key difference is steaming vs. pan-firing. Japanese green tea is steamed immediately after harvest, which preserves a bright green color and vegetal, umami-rich flavor. Chinese green tea is typically pan-fired (heated in a drum or pan), producing a more yellow-green color with toasty, nutty, or floral notes. Steaming also preserves up to 30% more catechins than pan-firing.

Why is Japanese green tea steamed instead of roasted?

Steaming was adopted in Japan because it produces a distinctly different flavor from Chinese pan-firing — brighter, more vegetal, and higher in umami. The rapid steaming also preserves more of the leaf's natural compounds, including L-theanine and EGCG. This steaming tradition, established in the 18th century by sencha inventor Nagatani Sōen, defines the Japanese green tea character.

What is the difference between first flush and second flush tea?

First flush (ichibancha) is harvested in April–May from leaves that accumulated amino acids during winter. It produces the sweetest, most complex, and most sought-after teas. Second flush (nibancha) in June–July produces leaves with higher catechin content and more astringency. First flush commands significantly higher prices — often 3–5x more than later harvests.

How is matcha made differently from other green teas?

Matcha follows a unique production path: leaves are shade-grown for 20–30 days, steamed, then dried flat (not rolled) to become tencha. Tencha is de-stemmed, de-veined, and ground into ultra-fine powder using granite stone mills that produce only 30–40 grams per hour. This slow grinding prevents heat damage and preserves matcha's vibrant color and delicate flavor.

Why is Japanese green tea so green?

The vibrant green color comes from chlorophyll preserved by the steaming process. When tea leaves are heated immediately after harvest, oxidation enzymes are deactivated before they can break down chlorophyll. Pan-fired teas lose more chlorophyll during the slower heating process. Shade-grown teas like matcha and gyokuro are even greener because shade-growing increases chlorophyll production.