Tencha is a shade-grown Japanese green tea that serves as the raw material for matcha. It consists of flat, delicate leaf flakes that have been steamed and dried but never rolled or kneaded, making it unique among Japanese green teas. While most people know matcha, few realize that before it becomes a fine powder, it exists in this distinct leaf form with its own flavor, processing method, and even a small but growing following as a standalone tea.
How Tencha Differs From Other Green Teas
The easiest way to understand tencha is to compare it with its closest relatives: gyokuro and sencha. All three start as leaves from the same tea plant, but their processing paths split early and sharply. Sencha and gyokuro go through steaming, then kneading, shaping, and drying. Kneading breaks down the cell walls of the leaves, which is what allows flavor to dissolve easily into hot water when you steep them.
Tencha skips the kneading step entirely. After steaming, the leaves are simply cooled and dried flat. Because tencha is destined to be ground into powder rather than steeped, there’s no need to break down cell walls through kneading. You’ll consume the entire leaf as matcha, so the flavor extraction happens in your cup, not during processing. This missing step is also what gives tencha its own distinctive character when brewed as a loose leaf: a pure, delicate, almost ethereal flavor that tea enthusiasts describe as noble and elegant.
Shade Growing and Why It Matters
Like gyokuro, tencha is shade-grown before harvest. Tea farmers cover the plants with nets that block a significant portion of sunlight, typically for about 30 days before picking. The shading can range from blocking 50% to 90% of sunlight, with higher-grade tencha receiving more intense shade coverage.
Blocking sunlight triggers a chemical shift in the leaves. The plant compensates by producing more chlorophyll (the pigment that makes leaves green) and boosts its production of an amino acid called L-theanine, which is responsible for the smooth, savory sweetness characteristic of high-quality matcha. In direct sunlight, the plant converts L-theanine into compounds called catechins, which taste more bitter and astringent. Shading essentially preserves the sweetness while deepening the green color. This is why the vibrant jade hue of matcha starts here, in the shaded tencha fields.
From Field to Flake: How Tencha Is Made
Once harvested, tencha leaves are immediately steamed to stop oxidation, just like other Japanese green teas. After steaming and cooling, though, the process becomes specialized. The leaves enter a piece of equipment called a tencha-ro, a drying oven built specifically for this tea and no other.
The tencha-ro is a 15-meter-long chamber containing three stacked belt conveyors. Rather than blasting leaves with hot air (which would damage their color and flavor), it gently transports them through a heated environment at temperatures between 180 and 200°C. The leaves spend roughly 20 minutes moving through the chamber, drying progressively on each tier. This conveyor system avoids the tumbling and agitation found in standard tea dryers, which protects the chlorophyll from heat damage and preserves the delicate aroma compounds that would otherwise evaporate.
After drying, the leaves go through a critical refining step: stems and veins are carefully removed. This secondary sorting matters more than you might think. If any fibrous material remains, it shows up as white specks in the final matcha powder and can even clog the stone mills used for grinding. High-precision sorting at this stage is what separates premium matcha from lower grades. What remains after de-stemming and de-veining are thin, flat leaf flakes. This is tencha in its finished form.
How Tencha Becomes Matcha
Grinding tencha into matcha has traditionally been done with granite stone mills. These mills turn slowly to avoid generating heat, which would degrade both color and flavor. The process is painstaking: a single stone mill can produce only a small amount of fine matcha powder per hour, which is one reason high-quality matcha is expensive.
For industrial-scale production, jet mills and ball mills have largely replaced stone grinding due to their higher throughput. The quality of the tencha itself determines whether the resulting matcha is ceremonial or culinary grade. Ceremonial matcha comes from the youngest, most carefully selected first-flush leaves and is meant to be whisked with water and drunk on its own. Culinary grade uses slightly more mature leaves and is formulated for lattes, smoothies, baking, and cooking.
Drinking Tencha as a Leaf Tea
Although tencha exists primarily as matcha’s precursor, it can be brewed and enjoyed on its own. This is still relatively uncommon, partly because most tencha goes straight to the grinder, but it has gained a niche following among tea enthusiasts who prize its unusual flavor profile.
Because the leaves were never kneaded, they don’t release their compounds into water as aggressively as sencha or gyokuro. The result is a lighter, more subtle cup with a clean sweetness and very little bitterness. Brewing tencha as a hot tea typically calls for water at 90 to 100°C with a short steeping time of 20 to 30 seconds. The flat, papery flakes unfurl quickly, so longer steeping isn’t necessary and can turn the brew grassy.
What Makes High-Quality Tencha
Color is the single most important commercial indicator of tencha quality. Vivid, deep green signals high chlorophyll content, which in turn reflects proper shading and careful drying. Research into tencha drying has shown that the specific temperature sequence matters: an initial period of higher heat followed by lower heat produces superior color by preserving chlorophyll while minimizing the formation of yellow pigments like lutein and beta-carotene. Tencha that looks dull, yellowish, or brownish was either insufficiently shaded, dried too aggressively, or made from older leaves.
Beyond color, the texture of the flakes matters for grinding. Properly processed tencha is light and brittle, almost like thin paper. This fragile structure is what allows stone mills to reduce it to the ultra-fine powder that defines matcha. If leaves retain too much moisture or still contain stem fibers, the grinding process produces a coarser, less uniform powder with diminished flavor. Every step in tencha production, from the weeks of shading to the precision of the final sorting, exists to serve that moment when stone meets leaf.