The B2B Guide to Yame Gyokuro & Tencha Cultivation

Q: Why is Gyokuro rolled while Tencha is not?

Gyokuro is rolled into needles to break cell walls so flavors dissolve during steeping. Tencha is dried flat without rolling to ensure it can be stone-ground into a uniform powder without clumping.

Q: What is Honzu shading?

Honzu shading is the traditional method using straw and reed screens on wooden frames. It filters up to 98% of sunlight while allowing rain to pass, creating the sweet umami flavor of premium Yame tea.

Q: Is all Yame Matcha made from Tencha?

Yes, authentic Yame Matcha is ground exclusively from shade-grown Tencha. Cheap alternatives are often made from unshaded Sencha leaves ground in industrial mills.

For specialty tea importers and high-end hospitality procurement leads, sourcing premium Japanese green tea goes far beyond standard leaf grades. To curate a menu that commands luxury margins, you must understand the agricultural techniques that happen before harvest. In Japan’s tea-growing capital of Fukuoka Prefecture, the steep mountain valleys of Yame (八女) are world-renowned for two elite shaded teas: Gyokuro (玉露 - shaded loose leaf) and Tencha (碾茶 - the raw leaf material stone-ground into matcha). Here is the professional B2B guide to how the traditional shading methods, cultivars, and microclimates of Yame define these two luxury teas, and how to source them at true farm value.

Executive Summary (TL;DR)

> What is the difference between Gyokuro and Tencha cultivation? > While both Yame Gyokuro and Tencha are shade-grown (被覆栽培 - *hihuku saibai*) for 20 to 30 days to maximize sweet L-Theanine, their processing methods diverge post-harvest. Gyokuro leaves are steamed, rolled, and dried into pine-needle shapes to preserve cell walls for loose-leaf steeping. Tencha leaves are steamed and dried flat in a specialized furnace without rolling, followed by the mechanical removal of all bitter stems and veins, leaving only pure leaf flakes ready for stone-milling.

1. The Power of Shade: Traditional Hihuku Saibai in Yame

The defining characteristic of both Gyokuro and Tencha is the deliberate deprivation of sunlight before harvest. This process, known in Japanese as *hihuku saibai* (被覆栽培), blocks direct sunlight to alter the plant's chemistry.

Honzu Shading (本ず) vs. Direct Netting: While mass-market farms drape black synthetic mesh directly over tea bushes (called *jika-kabu*), the top-tier growers of Yame construct elevated wooden frameworks (*tana*) and weave traditional straw screens (*Honzu*). Straw allows rain and morning dew to filter through gently while creating a humid, warm microclimate that coaxes out the deep, sweet umami flavor.
Shading Timeline: The shading period lasts for 20 to 27 days for Gyokuro and 20 to 30 days for Tencha. During this time, the bushes are covered in stages, starting at 60% shade and ramping up to over 95% light block in the final days before harvest.

This shading blocks photosynthesis, preventing the savory amino acid L-Theanine from converting into bitter catechins. Yame produces roughly 45% of Japan's total Gyokuro, despite representing a tiny fraction of overall national tea acreage, because its mountain fog acts as a natural auxiliary shade.

2. Cultivar Specialization: Cultivating Sweetness

The choice of tea cultivars (*cha-shu*) planted in Yame is heavily biased toward naturally sweet, umami-rich plants that thrive in shaded conditions.

Saemidori (さえみどり): Revered for its brilliant emerald-green color and smooth, low-astringency taste. It is highly sensitive to spring frost but flourishes in the warm, volcanic mountain soil of Fukuoka.
Okumidori (おくみどり): A late-budding cultivar that provides excellent structural balance and a clean, refreshing aroma when shaded.
Yabukita (やぶきた): Japan's standard tea cultivar, representing about 70% of national tea fields. While highly balanced, standard Yabukita lacks the intense sweetness and color pop that *Saemidori* yields when grown for high-end Tencha or Gyokuro.

3. Post-Harvest Processing: Shaded Loose Leaf vs. Stone-Ground Flakes

Once the shade nets are rolled back and the top tender leaves are harvested, the processing pathways diverge completely to create the final products. | Cultivation Parameter | Yame Gyokuro (Shaded Loose Leaf) | Tencha (Raw Matcha Leaf) | | :--- | :--- | :--- | | Shading Method | Elevated frames (*Tana*) with straw (*Honzu*) or net | Elevated frames or direct netting | | Shading Duration | 20 to 25 days (traditional: 27 days) | 20 to 30 days | | Harvest Style | Primarily hand-picked (*temichi*) for elite grades | Hand-picked or fine-tuned machine harvest | | Steaming | Light to medium steam to lock color | Light steam to preserve delicate aroma | | Rolling (揉ねん) | Rolled repeatedly into needle shapes | Zero rolling. Dried flat in a furnace | | Stems & Veins | Left intact (provides structure in loose leaf) | Fully removed via mechanical sorting | Because Tencha is dried flat without rolling, its cell walls remain intact. This allows the dry flakes to be stored stably in freezing conditions for months before grinding, protecting the delicate chlorophyll from oxidizing. That Tencha is later milled into matcha and shipped direct from Fukuoka.

4. B2B Sourcing Strategy for High-End Tea Service

When sourcing shaded teas for restaurants, hotels, or boutique retail brands, keep these three guidelines in mind: 1. Request the Certifications: Genuine organic Gyokuro and Tencha should carry the Organic JAS certification. Due to shading, plants are weakened and vulnerable to pests, making organic shaded farming extremely rare and expensive. 2. Verify the Harvest Date: Premium Yame Gyokuro and First-Flush Tencha are harvested only once a year in spring (May). Sourcing fresh spring-harvested lots ensures maximum L-Theanine levels. 3. Evaluate the Grinding Source: True matcha must be stone-ground from Tencha. If a supplier offers cheap "green tea powder" made by grinding sun-grown Sencha leaves or whole tea leaves (including stems) in industrial hammer mills, the resulting tea will taste bitter and sandy. At Yame Matcha Direct, we work directly with multi-generational farming families in Fukuoka. By bypassing brokers, we offer authentic, Organic JAS-certified spring Gyokuro and fresh Yame Matcha at true, uninflated farm value. [Explore our wholesale green tea catalogs and request your B2B Trial Sample Kit today.](#order)

FAQ: Gyokuro & Tencha Cultivation

Why is Gyokuro rolled while Tencha is not?

Gyokuro is rolled into needle shapes to break the cell walls of the leaves, allowing the flavor compounds to dissolve into water during loose-leaf brewing. Tencha is dried flat without rolling because it is designed to be stone-ground into a fine powder; rolling would cause the leaves to clump and grind unevenly.

What is Honzu shading?

Honzu shading is the traditional method of covering tea bushes using natural straw and reed screens supported by wooden scaffolding. The straw allows rain and dew to gently pass through while filtering out up to 98% of direct sunlight, imparting a unique sweet aroma called *ooika*.

Is all Yame Matcha made from Tencha?

Yes, authentic matcha must be ground from Tencha. Products labeled as matcha that are bitter, dull yellow, or gritty are typically made from sun-grown *Sencha* leaves ground with high-speed industrial mills.

Karen Hashimoto

Curator & Export Compliance Director · Yame Matcha Direct

Karen sources directly from Japanese producers and handles export compliance for B2B buyers in 50+ countries. Based in Fukuoka, Japan. @konnichiwa.karen