The Tea Plant and Its Climate Zones

Goal: After this lesson you can describe what Camellia sinensis needs to grow and how different climate zones change the flavor. Subject: Geography | Run time: about 7 minutes

Quick recall

Last time we set up the episode. Two quick questions. One: what single plant do all true teas come from? Camellia sinensis (Mair & Hoh, 2009). Two: what decides whether a leaf becomes green or black tea? The processing, not the plant (Mair & Hoh, 2009).

Why this matters

Tea is more forgiving than coffee about where it grows. Coffee needs a narrow belt. Tea spreads from about 42 degrees north, in the country of Georgia, all the way to 33 degrees south in South Africa (Mair & Hoh, 2009; International Tea Committee, 2023). One plant, a huge range, and the place it grows changes the cup more than you would guess.

The idea

Start with what the plant wants. Camellia sinensis grows across a wide temperature range, roughly 50 to 85 degrees Fahrenheit depending on the zone, in soil that is acidic, even more acidic than coffee likes, around pH 4.5 to 5.5 (Mair & Hoh, 2009; International Tea Committee, 2023). It can take light frost but a hard, sustained frost kills it. The leaf carries a compound called theanine (THEE-ah-neen), an amino acid found almost nowhere else in nature, only in tea and one species of mushroom (Mair & Hoh, 2009). Now the interesting part. Geographers sort tea land into climate zones, and the zone shapes the flavor. In high mountains, like Darjeeling in India at around 6,000 feet, the plant grows slowly through a short season, and slow growth builds complex flavors, including the prized note tea people call muscatel (Mair & Hoh, 2009; Food and Agriculture Organization of the United Nations, 2023). Drop down to a tropical lowland like Assam, also in India, and the plant grows all year in the heat. Fast growth makes a strong, malty, bold tea (Food and Agriculture Organization of the United Nations, 2023). On ocean islands like Sri Lanka, the sea moderates the temperature and the tea turns bright and citrusy. And in cold continental zones with hard winters, the plant goes dormant, stops growing, and that pause concentrates the flavor in the leaf (Mair & Hoh, 2009).

Picture it

Picture the same plant set down in four places. On a cold mountain it grows slowly and tastes complex. In a hot lowland it races up and tastes bold. On a sea island it tastes bright. In a place with hard winters it sleeps half the year and wakes up concentrated. Same leaf, four climates, four cups. The map on this lesson marks the contrast between high Darjeeling and lowland Assam.

Remember this

The fact to carry out: with tea, the climate zone is doing the work that terroir does for coffee. The plant is one species across a wide range, and altitude, heat, ocean, and dormancy each push the flavor a different way (Mair & Hoh, 2009; Food and Agriculture Organization of the United Nations, 2023). When you taste a complex mountain tea against a bold lowland one, you are tasting geography.

Quick check

Quick check. A tea is grown slowly at high altitude and comes out complex and muscatel. Mountain or lowland? Mountain, like Darjeeling. Lowland heat gives fast growth and bold, malty tea instead (Food and Agriculture Organization of the United Nations, 2023).

Key Takeaways

Camellia sinensis grows across a wide range, about 42 degrees North to 33 degrees South, in acidic soil, and dies in hard frost (Mair & Hoh, 2009; International Tea Committee, 2023).
Tea leaves carry theanine, an amino acid found almost only in tea (Mair & Hoh, 2009).
Climate zone shapes flavor: high-altitude slow growth gives complex muscatel tea; tropical lowland gives bold malty tea (Food and Agriculture Organization of the United Nations, 2023).
Cold-winter dormancy concentrates flavor in the leaf (Mair & Hoh, 2009).

Sources

Food and Agriculture Organization of the United Nations. (2023). Tea market report 2023. https://www.fao.org
International Tea Committee. (2023). Annual bulletin of statistics 2023. https://www.inttea.com
Mair, V. H., & Hoh, E. (2009). The true history of tea. Thames and Hudson.