What Is Green Tea?

Introduction

Green tea is defined by what does not happen to it: {{glossary:oxidation}}. After plucking, fresh leaves are quickly heated to deactivate the polyphenol oxidase enzyme, preserving the leaf's green color, fresh aroma, and high {{glossary:catechins}} content. This simple principle — stop oxidation before it starts — produces the world's most consumed tea category.

Chinese vs Japanese Methods

The two dominant green tea traditions differ in how they achieve fixation. Chinese green teas are pan-fired (chao qing) in hot woks or drum roasters, producing a toasty, nutty, sometimes chestnut-like character. The leaf tends to be hand-shaped into distinctive forms: flat (Longjing), rolled pearls (Bi Luo Chun), or twisted needles (Mao Feng). Japanese green teas are steamed (mushisei), preserving a brighter, more vegetal, umami-rich profile. The leaf is typically rolled into thin needles (sencha) or ground to powder (matcha).

Flavor Profile

Green tea's unoxidized chemistry produces a distinctive flavor spectrum: vegetal (spinach, asparagus), marine (seaweed, ocean), nutty (chestnut, almond), floral (jasmine, orchid), and sweet (honey, brown sugar). Japanese greens tend toward the vegetal-marine end; Chinese greens toward nutty-floral.

Health Significance

Because oxidation converts catechins into theaflavins, green tea retains the highest concentration of intact catechins — particularly {{glossary:egcg}} — making it the most studied tea type for health benefits. However, the catechin content also means green tea is the most sensitive to brewing errors: water that is too hot or steeping too long extracts excessive catechins, producing harsh bitterness.

Global Production

China produces approximately 45% of the world's green tea, Japan 5%, and the remainder comes from Vietnam, Indonesia, and other Asian nations. Green tea accounts for roughly 30% of global tea production by weight but is growing faster than other categories.