Introduction

Green tea, the unfermented (0 % oxidation) jewel of Camellia sinensis, is prized for its bright vegetal notes, delicate sweetness, and high concentration of catechins and amino acids. Because its leaves undergo minimal processing, the soluble compounds that give green tea its flavor and health benefits are extracted more readily than in oxidized teas, making precise control of the tea‑to‑water ratio and steeping time essential. This guide breaks down the brewing process into three phases of infusion—early (1st‑3rd), middle (4th‑6th), and late (7th+)—and provides evidence‑based recommendations that can be adapted to leaf form, varietal characteristics, and personal taste.

Understanding Green Tea: Leaf Chemistry and Brewing Variables

The chemical makeup of green tea leaves determines how quickly flavor compounds dissolve. Key groups include:

  • Catechins (especially epigallocatechin‑3‑gallate, EGCG) – responsible for astringency and antioxidant activity; they extract rapidly at temperatures above 60 °C.
  • Amino acids (notably L‑theanine) – contribute umami sweetness; they dissolve more slowly and are favored by lower temperatures.
  • Volatile aromatics** (aldehydes, alcohols) – give the fresh, grassy nose; they are volatile and can be lost with excessive heat or time.
  • Chlorophyll and pigments** – affect color and mouthfeel; they are relatively stable but can impart a bitter edge if over‑extracted.

Historical texts such as Lu Yu’s The Classic of Tea (Chájīng, 8th century) note that “the water should be just shy of boiling and the leaves should be allowed to unfurl slowly,” a principle echoed in modern research showing that optimal catechin extraction for green tea occurs between 70 °C and 80 °C, while L‑theanine peaks around 50 °C–60 °C. Balancing these competing extraction curves is the heart of proper ratio and timing.

Core Principle: Tea‑to‑Water Ratio

The ratio defines the concentration of soluble solids in the liquor and directly influences strength, body, and bitterness. While personal preference plays a role, scientific and traditional guidelines converge on a range that works for most loose‑leaf green teas.

Loose Leaf

For standard loose‑leaf sencha, dragonwell (Longjing), or pan‑fired varieties, the widely cited ratio is 2 g to 3 g of tea per 100 ml of water (approximately 1 level teaspoon per 3.4 oz). This yields a brew strength of about 1.5 %–2.0 % total dissolved solids (TDS), which matches the sensory profile described in the Song dynasty manual Tea Record (茶録, 12th century) as “clear, bright, and refreshing without heaviness.”

Tea Bags

Commercial tea bags often contain finely cut leaves (fannings or dust) that extract faster. To avoid over‑extraction, reduce the leaf amount to 1.5 g to 2.0 g per 100 ml (roughly half a teaspoon). Some manufacturers pre‑measure bags for 2 g per 180 ml cup; in that case, follow the manufacturer’s suggestion but consider lowering the water temperature by 5 °C–10 °C.

Powdered (Matcha)

Matcha is a special case because the whole leaf is consumed. The traditional usucha (thin tea) ratio is 1 g (≈½ teaspoon) of matcha per 60–80 ml of water** (≈2–2.7 oz). For a thicker koicha, increase to 2 g per 30–40 ml. Because