Camellia Sinensis — The Plant Behind Matcha — Kiyocha

Camellia Sinensis — The Plant Behind Every Cup

Every cup of tea you've ever had — black, green, white, oolong — came from the same plant. Camellia sinensis is a flowering evergreen shrub native to Southwest China and Southeast Asia, and it's the sole botanical source of all true tea. Coffee has dozens of species. Tea has one.

What makes Camellia sinensis unusual isn't its appearance — it looks fairly unremarkable in the field, a dense leafy shrub with small white flowers — but its chemistry. The leaves contain caffeine, L-theanine, and a class of antioxidants called catechins, in a combination that doesn't exist anywhere else in the plant kingdom. How you grow the plant, and which part of it you harvest, determines how much of each compound ends up in your cup.

Two main varieties

There are two primary varieties of Camellia sinensis used in tea production. The first is Camellia sinensis var. sinensis — the Chinese variety. It has smaller leaves, grows slowly, and handles cold weather well. This is the variety used for Japanese green teas, including matcha. The second is Camellia sinensis var. assamica — the Assam variety, originally from India. It has larger leaves, grows faster, and produces the bold, malty character associated with black teas.

For matcha, sinensis is the only variety worth knowing. Its smaller leaves and slower growth concentrate flavour compounds more densely, producing a more nuanced, complex tea.

Why shade matters

The way Camellia sinensis responds to light is what makes high-quality matcha possible. When farmers cover the plants three to four weeks before harvest — blocking out up to 90% of sunlight — the plant responds by producing more chlorophyll to capture what little light remains. Chlorophyll is what gives matcha its intense green colour.

Shade also slows the conversion of L-theanine into catechins. In an unshaded plant, L-theanine — the amino acid responsible for matcha's calm, focused effect — gradually breaks down into bitter-tasting catechins as the season progresses. Shade interrupts that process, keeping L-theanine levels high and bitterness low. The result is a leaf that's sweeter, smoother, and significantly more complex than anything grown in full sun.

This shading technique, called tana in Japanese, is what separates tencha — the raw leaf that becomes matcha — from other green teas. It's labour-intensive and adds cost, but it's not optional. Without it, you don't have matcha. You just have green tea powder.

From leaf to powder

After harvest, the young leaves are steamed to stop oxidation, then dried and sorted. Veins and stems are removed — these are harder, more bitter, and would affect the texture of the final powder. What remains is tencha, a flat, brittle dried leaf that doesn't yet resemble anything like matcha.

Tencha is then stone-ground, slowly, into the fine powder we know. Traditional granite millstones rotate at a controlled speed to generate minimal heat — heat degrades flavour and colour. Even so, it can take over an hour to produce 40 grams of finished matcha. The fineness of the grind determines how smoothly it dissolves in water and how the foam forms when whisked.

The entire process — from shading a living plant to the powder in the tin — is a direct extension of Camellia sinensis and its particular relationship with light, soil, and temperature. Change any of those variables and the tea changes with them.

That's why origin matters. And why we're specific about ours.