Green tea comes from the leaves of Camellia sinensis, an evergreen shrub native to East Asia. It is the same plant that produces black tea, white tea, and oolong. What makes green tea “green” is how the leaves are processed after picking: they’re heated quickly to prevent oxidation, preserving their color, fresh flavor, and nutrient content.
The Plant Behind Every Cup
Camellia sinensis belongs to the Theaceae family and grows in two main varieties. The sinensis variety originated in China and produces smaller, more delicate leaves suited to green and white teas. The assamica variety, native to the Assam region of India, has larger leaves and is more commonly used for black tea, though it can be processed into green tea as well.
The tea plant has bright, shiny leaves with serrated edges and a slightly fuzzy underside. Only the youngest growth is picked: the tip bud and the first two or three leaves below it. These young leaves are lighter in color than mature foliage and contain the highest concentration of flavor compounds and beneficial plant chemicals. Most harvesting is still done by hand, especially for premium grades.
China: Where It All Started
Green tea traces its roots to China, with historical accounts dating the first use back to around 2737 BC. The popular origin story credits Emperor Shennong, who supposedly drank water that a dead tea leaf had accidentally fallen into. For centuries after that, green tea was expensive and reserved for the upper tiers of Chinese society. It wasn’t until the 14th century that it became widely accessible for both everyday enjoyment and medicinal use.
China remains one of the world’s largest green tea producers. Provinces like Zhejiang, Anhui, Fujian, and Yunnan each produce distinctive styles. Chinese green tea is typically processed by pan-firing the leaves in a heated wok or drum at temperatures between 200 and 300 degrees Celsius for a brief period. This stops oxidation and gives the tea its characteristic toasty, nutty, sometimes lightly smoky flavor. Famous Chinese green teas include Longjing (Dragon Well), Biluochun, and Gunpowder.
Japan’s Distinct Approach
Japan took a fundamentally different path with green tea processing. Rather than pan-firing, Japanese producers steam freshly picked leaves for 15 to 45 seconds, a technique called sasshin. This quick burst of steam deactivates the enzymes that cause oxidation while preserving vegetal, marine, and umami flavors that are the hallmark of Japanese green tea.
The steaming method also retains higher concentrations of antioxidants, chlorophyll, and vitamin C compared to pan-firing, which is one reason Japanese green tea tends to be more vivid in color. If you’ve ever noticed that a cup of sencha looks grassier and tastes more savory than a cup of Chinese Longjing, the processing method is the primary reason.
Japan has several celebrated tea-growing regions. Shizuoka prefecture, located roughly in the center of the country, produces nearly 40% of Japan’s total tea output and is best known for sencha. Kagoshima, on the southern island of Kyushu, is the second largest producer, with the towns of Chiran and Kirishima yielding especially high-quality leaves. Then there’s Uji, a small city near Kyoto that accounts for only about 3% of Japan’s production but is considered the cradle of Japanese green tea. Uji is where the sencha production process was originally developed, and it still supplies some of the most prized matcha and gyokuro in the world. The tiny region of Yame, in Fukuoka prefecture, rivals Uji for gyokuro quality.
Where Else Green Tea Grows
While China and Japan dominate the green tea landscape, the plant grows across a wide subtropical and tropical band. India, Kenya, Sri Lanka, Vietnam, and Indonesia all produce green tea in varying quantities. South Korea has a long tea tradition of its own, with regions like Boseong growing green tea in a style that blends Chinese and Japanese influences. In recent decades, countries in East Africa have expanded green tea production significantly for export markets.
What all these regions share is a climate the tea plant thrives in: warm temperatures, consistent rainfall, and well-drained, slightly acidic soil. Higher altitudes generally produce more complex flavors because cooler temperatures slow leaf growth, concentrating flavor compounds. Research on tea grown at different elevations confirms that altitude changes temperature, sunlight intensity, and soil chemistry in ways that measurably alter the finished tea’s profile.
How Harvest Timing Shapes the Tea
The time of year leaves are picked matters almost as much as where they’re grown. The first harvest, called the “first flush” or “spring flush,” happens between March and May. These leaves are the most tender and pale green, benefiting from the plant’s initial burst of growth after winter dormancy. First flush teas are prized for light, floral notes, a touch of natural sweetness, and higher antioxidant levels. In Japan, the very first sencha of the season is called shincha, and it commands premium prices for its bright, fresh character.
Later harvests through summer and autumn produce leaves that are more robust and slightly more astringent. They’re still good tea, but they lack the delicacy of spring pickings. Many everyday green teas sold in supermarkets are blends from multiple harvests, while single-flush teas are typically marketed to enthusiasts willing to pay more for seasonal nuance.
From Leaf to Cup
Regardless of origin, the basic green tea process follows the same logic: pick young leaves, heat them quickly to stop oxidation, shape them, and dry them. The heating step is what separates green tea from black tea. Black tea leaves are deliberately bruised and left to oxidize fully, turning them dark and developing bold, malty flavors. Green tea skips that oxidation entirely, which is why it retains its green color, lighter body, and grassy or vegetal taste.
After heating (whether by steaming or pan-firing), the leaves are rolled or shaped. Japanese sencha is typically rolled into tight, needle-like strands. Chinese teas come in a wider variety of shapes: flat-pressed (Longjing), tightly rolled pellets (Gunpowder), or gently twisted. The shaping influences how quickly the leaves release flavor when steeped. Finally, the leaves are dried to reduce moisture content below 5%, making them shelf-stable. The entire process from fresh leaf to finished tea can happen within a single day.