Black Tea and Green Tea Start With the Same Plant
Franz Eugen Köhler, 1897. Public domain, via Wikimedia Commons. Image source.
Put green tea beside black tea, and they can seem like entirely different ingredients. The color, aroma, and flavor all suggest different beginnings.
But both come from the same species of plant. Much of their difference is created after the harvest, while the leaves are being processed.
What can a tea maker do to turn a green leaf into such different drinks?
One species, many possibilities
The plant is Camellia sinensis. Its cultivated varieties, growing conditions, and harvests differ, so saying “the same plant” does not mean every cup begins with identical leaves. It means black and green tea are not separate botanical species.
The category also has a boundary. Peppermint, chamomile, and other herbal infusions come from other plants. They can share the teapot and the supermarket shelf without sharing tea’s botanical identity.
The important decision after picking
For black tea, processing allows substantial oxidation: reactions involving oxygen and compounds in the damaged leaf change its color and flavor. Withering and rolling or cutting help prepare the leaves for those changes before drying finishes the process.
For green tea, heat is applied early to inactivate the enzymes involved. Steaming or pan-firing helps preserve a different set of characteristics before the leaves are dried. Oolong processing allows a degree of oxidation between the usual green and black approaches.
People have sometimes called black-tea oxidation “fermentation.” That traditional usage can confuse the story, because it does not mean the same thing as a microbial fermentation such as the one used to make yogurt.
The factory is part of the flavor
It is tempting to imagine that the tea maker merely dries whatever nature supplied. In fact, handling, timing, heat, and exposure help determine what the harvested leaf becomes.
The comparison is useful the next time two cups taste completely different. Some differences begin in the field; others are decisions made afterward. Knowing the species answers only the first part of the question.
Two very different cups can begin on the same branch of the botanical family tree.
Sources and image credits
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