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Oolong Tea
Between shadow and light, oolong tea (or blue tea) charts its own course. Neither fully green nor completely black, this semi-oxidized tea born in the mists of Fujian unfolds a palette of aromas of rare richness, from delicate florals to deep roasted notes. Each leaf carries the mark of centuries-old craftsmanship and a precise terroir.
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What is Oolong Tea?
Oolong tea (also known as blue tea, or wulong tea) is a semi-oxidized tea from China and Taiwan, with a level of partial oxidation ranging from 10 to 70%. It holds a unique place between green tea (unoxidized) and black tea (fully oxidized), offering an aromatic range that spans from the most delicate florals to the deepest roasted notes. Its name means "black dragon" in Mandarin, a reference to the twisted shape of the tea leaves after processing.
The term "Oolong" comes from the Chinese "Wu Long". Several names coexist within this family: wulong tea, blue-green tea, or simply blue tea. This diversity of names reflects the sensory richness of the category, where each variety expresses its own character depending on the terroir, the cultivar, and the producer's expertise. For a detailed look at this remarkable family, its cultivars, and its different approaches to processing, see our complete guide to Oolong tea.
Origins and Terroirs of Oolong Tea
The historic home of Oolong tea is Fujian Province, on the southeastern coast of China. It was here, in the Wuyi Mountains and around the city of Anxi, that the first oolongs were crafted in the 17th and 18th centuries. Guangdong, in the far south, also produces oolong, most notably its celebrated Dan Cong teas from Phoenix Mountain, each grown from a single cultivar. In Taiwan, oolong became a true national specialty from the 19th century onward, when immigrants from across the strait brought their plants and techniques with them. Today, the island of Taiwan produces some of the most acclaimed oolongs in the world, including Dong Ding and the Milky Oolong Jin Xuan, grown in the Nantou district.
Semi-Oxidized Tea: a Balance Between Green and Black
What sets Oolong tea apart from every other family is its semi-oxidation process. After picking, the leaves are first withered in the sun, then gently tumbled to begin oxidation. The tea master then halts this process at a precise moment of his choosing, through a rapid heating that deactivates the enzymes responsible for browning. The resulting degree of oxidation, ranging from around 10% for the greenest oolongs to 70% for the most roasted, entirely determines the final sensory profile. The same cultivar can therefore yield two radically different oolongs depending on the producer's decision. This personal signature makes semi-oxidized tea the most expressive category in the world of tea.
The history and heritage of Oolong tea
The story of Oolong tea stretches back to the Song dynasty (960–1279), though the semi-oxidation technique as we know it was codified later, during the Ming and Qing periods. Legend has it that a hunter from Fujian named Wu Liang, distracted by a deer, forgot his basket of freshly picked leaves. By the time he returned, the leaves had begun to oxidize, giving rise to an entirely new sensory profile. Over the centuries, Oolong became a tea prized by emperors and a defining emblem of southeastern China, celebrated for its floral fragrances and beautifully balanced palate. This ancient legend is a reminder that the finest flavours often begin with a happy accident.
The arrival of Oolong in Taiwan during the 19th century marked a turning point for the category. Immigrants from the mainland brought with them both the plants and the production techniques, but the island's humid climate, high altitudes and volcanic soils offered growing conditions unlike anything they had known before. Taiwanese producers gradually developed their own approaches: ball-rolled oolongs, lighter oxidation, charcoal roasting. From this era emerged iconic cultivars such as Jin Xuan (cultivar no. 12, created in 1981 by the Taiwan Tea Research and Extension Station), which forms the basis of our Milky Oolong, with its naturally creamy, warm-milk notes.
The great varieties of Oolong tea
The Oolong family encompasses around twenty major varieties, each recognisable by its cultivar, terroir or processing technique. Below are the most iconic styles you will encounter among tea lovers and within our own selection.
- Tie Guan Yin: from the Anxi district of Fujian, a lightly oxidized Oolong with refined orchid notes, and one of the cornerstones of the category.
- Da Hong Pao: a grand cru from the Wuyi Mountains (Fujian), prized for its complex mineral aromas and deep roasting in a traditional charcoal kiln.
- Dong Ding: a Taiwanese Oolong from the Nantou highlands, sitting midway between green and roasted, known for its balance of vegetal and caramel notes.
- Baozhong (Pouchong): a very lightly oxidized Taiwanese Oolong (10–15%), close in character to green tea, with fresh, floral aromas of great delicacy.
- Dan Cong: from Phoenix Mountain (Guangdong), each Dan Cong is grown from a single-variety bush and crafted to express a specific aroma (orchid, honey, gardenia).
- Shui Xian: a moderately roasted Oolong from the Wuyi Mountains, with mineral and woody notes, a classic of southeastern China.
- Jin Xuan: the Taiwanese cultivar at the heart of Milky Oolong, known for its naturally creamy, milk-like character.
How to Brew Oolong Tea?
Brewing Oolong requires a little care with temperature and steeping time: its delicate aromas don't take well to water that's too hot or a careless approach. The Western method, straightforward and unfussy, is a great way to enjoy an oolong every day. The traditional gong fu cha technique, rooted in Chinese tea culture, takes things further, coaxing out the full depth of a fine oolong through a series of short, successive infusions in a small clay teapot.
The Western approach: simple and quick
- Use filtered water heated to between 80 and 90 °C, depending on the level of oxidation (the greener the oolong, the cooler the water should be).
- Allow around 3 to 5 g of loose-leaf tea per 200 ml of water, roughly a heaped teaspoon per cup.
- Steep for 1 to 3 minutes for the first infusion, gradually increasing the time for subsequent ones.
- The leaves can be re-steeped 2 to 4 times on average, with some Taiwanese varieties holding up to 6 infusions without losing their character.
The gong fu cha method for exceptional teas
For premium oolongs such as Tie Guan Yin Premium or Da Hong Pao, the gong fu cha approach (literally "tea made with skill") elevates the aromas beautifully. Use a small porcelain or zisha (Yixing clay) teapot, a generous leaf ratio (5 to 7 g per 100 ml), and very short infusions (10 to 30 seconds) repeated 6 to 10 times. Each pour reveals a different facet, like a gradual journey into the heart of the garden where the tea was grown. A well-seasoned teapot deepens the experience further. For more detail, see our complete brewing guide.
When to Enjoy Oolong Tea?
With its moderate caffeine content and richly layered sensory profile, Oolong fits naturally into many moments of the day. In the morning, roasted oolongs and medium-oxidised Taiwanese varieties offer a gentle, steady energy without the edge of coffee. Through the middle of the day, more floral oolongs such as Baozhong or our Jianxing Blue Tea make for a refined pause, lovely alongside a pastry or at the end of a meal. Later in the day, something softer works best, like our Orange Blossom Oolong, steeped lightly so it doesn't interfere with sleep.
Oolong is also wonderful as an iced tea, especially in summer: cold-brew for 4 to 6 hours in the fridge using 12 g per litre of water. The floral and fruity notes of a Taiwanese oolong shine particularly well in a cold infusion, which removes any trace of bitterness and preserves the tea's natural finesse. Add fresh ginger and lime for a sparkling, alcohol-free drink that feels genuinely elegant. A piece of fresh fruit on the side, a peach or a fig, rounds out the experience perfectly.
When it comes to food pairings, roasted oolongs complement caramel, dark chocolate and dried fruit desserts, echoing and extending their warm, rounded notes. Lightly oxidised, floral oolongs are a natural match for fresh pastries, almond biscuits, macarons and rose or orange blossom entremets. For lovers of Asian cuisine, a plain Oolong pairs beautifully with dim sum, steamed dishes and sticky rice desserts.
Our Selection of Organic Oolong Teas
Our range brings together around fifteen Oolong teas, chosen for their aromatic diversity and garden quality. From Chinese classics to contemporary blends, by way of Taiwan's most celebrated varieties: tea lovers will find both pure oolongs and flavoured creations, available in 100 g bags or loose-leaf format. Five broad families shape our selection: pure Chinese oolongs (Tie Guan Yin, Shui Xian, Fu Liang), Taiwanese oolongs (Milky Oolong, Dongaao), indulgent flavoured oolongs (Peach Vanilla, Almond Chocolate), floral oolongs (Lady Clochette lily of the valley, Orange Blossom) and travel oolongs (Mountain of Tibet, Nepal Jun Chiyabari). Every reference is sourced directly from the producer, and the majority of the range is certified organic.
Storing Oolong Tea and Shelf Life
Among all tea families, Oolong is one of the most stable in storage, thanks to its semi-fermentation. Lightly oxidised oolongs keep well for around a year under good conditions, while roasted oolongs are best enjoyed within six months to preserve their signature toasted character. To protect the aromas, store your tea away from light, moisture and strong odours, ideally in an airtight tin kept well away from spices and scented products. Avoid the refrigerator: its humidity and ambient smells transfer quickly to the leaves.
Some heavily roasted, highly oxidised oolongs can even be aged intentionally: re-fired every two to three years by a tea master, they develop notes of dried fruit, leather and cacao over time, not unlike a fine wine built for cellaring. This tradition, most common in Taiwan and the Wuyi Mountains, makes organic Oolong tea one of the rare teas whose aromatic value can actually deepen with age, provided storage conditions are respected. For flavoured oolongs and modern blends, however, it's best to enjoy them while fresh, within the year of purchase. A well-kept aged oolong can offer a tasting experience that is truly unforgettable.
How is Oolong tea made?
The production process for Oolong tea is one of the most demanding in the world of tea, involving up to eight successive stages whose precise sequence determines the final character of the leaf. It begins with hand-picking, typically limited to the bud and the first two leaves. The leaves are then withered in the sun to draw off some of their moisture, before being brought indoors for an air-withering stage that softens the plant material. Next comes tossing, the defining step: the leaves are shaken in baskets or gently tumbled, bruising their edges and triggering enzymatic oxidation.
The oxidation that follows is the most delicate phase of all. The tea master watches colour and fragrance closely, stopping the process at precisely the right moment. This is achieved through fixing: a brief blast of high heat (pan-firing, steaming, or a mechanical drum) that deactivates the enzymes responsible for browning. The leaves are then rolled, often by hand for premium batches, giving them their characteristic shape: tight balls for Taiwanese oolongs, twisted cords for Chinese ones. Drying then stabilises the remaining moisture. Some oolongs undergo a final roasting over charcoal or in a drum oven, which develops rounder, toasted, lingering notes.
The three main levels of oxidation
The degree of oxidation, which can range from 10 to 70%, is the most telling signature of an oolong. Lightly processed oolongs (10–30%), such as Baozhong or modern Tie Guan Yin, retain leaves close to green and offer very fresh floral and vegetal nuances. Medium-oxidised oolongs (40–60%), such as Dong Ding or our Fu Liang Farm, develop fruity notes and a more pronounced body. Heavily oxidised oolongs (60–70%), such as certain Da Hong Pao or roasted Dan Cong, present woody, honeyed, and caramel touches that bring them close to black tea, without the bitterness.
Benefits and characteristics of Oolong tea
Oolong tea is recognised by its twisted leaves (in Chinese varieties) or ball-rolled leaves (in Taiwanese ones, like our Milky Oolong), ranging in colour from deep green to amber depending on oxidation. The brewed liquor is clear and bright, in shades of gold to amber. The aroma is layered, moving between floral, fruity, and sometimes woody or roasted notes. On the palate, it combines the freshness of green tea with the depth of black tea, carrying a silky quality that is entirely its own.
Nutritionally, Oolong tea provides antioxidant polyphenols (catechins, theaflavins, thearubigins). It contains a moderate level of caffeine (15–30 mg per 200 ml), balanced by L-theanine, an amino acid with relaxing properties that softens the stimulating effect. Oolong tea is also known for its role in digestion: some studies suggest it stimulates digestive enzymes and may reduce bloating after fatty meals, though it is not a medical treatment. For more on these effects, visit our dedicated page on the benefits of Oolong tea.
Oolong tea and metabolic support
The landmark study Rumpler et al., 2001, Journal of Nutrition highlighted a modest increase in energy expenditure among regular Oolong tea drinkers, linked to its polyphenols and caffeine. These effects remain moderate and are no substitute for a balanced diet or regular physical activity. For those pursuing weight management, Oolong tea can be a helpful complement to an overall healthy lifestyle, without any claim to miracles. These benefits apply only within the context of an active way of living.
Oolong tea, green tea, and black tea: what's the difference?
The Oolong family defines itself in contrast to its two neighbours. Green tea is fixed immediately after picking, with no oxidation: it retains the vegetal freshness of the leaf but tends toward a lighter character. Black tea, by contrast, is fully oxidised, developing malty, honeyed, and woody aromas, but losing much of its floral complexity. Oolong sits precisely at the crossroads: a lightly processed oolong can evoke a very expressive green tea, while a roasted oolong moves toward the rounded depth of black tea, without the bitterness. It is this aromatic range that makes Oolong tea the most diverse and endlessly rewarding category for tea lovers.
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