Fu brick tea (茯砖, pronounced "foo jwahn") is a compressed Chinese dark tea from Hunan Province, famous for the tiny golden specks inside the brick called "golden flowers." Those specks are Eurotium cristatum, which develops naturally inside the brick during a slow, carefully managed stage called "flowering." The result is a smooth, mellow, woody tea that keeps evolving as it ages.
I grew up in Xinhua County, Hunan, in the heart of China's dark tea country. Here is what Fu brick tea is, how the golden flowers get there, and how to brew it.
Quick facts
- What it is: a pressed brick of Chinese dark tea (hei cha, 黑茶) made from the tea plant Camellia sinensis
- Where it is made: mainly Hunan Province, China, including Xinhua and Anhua counties
- Signature feature: "golden flowers" (金花, jin hua), the golden spores of Eurotium cristatum
- Taste: mellow, woody, gently sweet, with a clean mushroom-like aroma
- Caffeine: yes, it is made from tea leaves
- Aging: like wine, it is often aged for years and changes over time
What is dark tea?
Chinese tea is traditionally grouped into six families: green, white, yellow, oolong, black (called "red tea" in China), and dark tea. Dark tea is the only family that goes through post-fermentation: after the leaves are processed, microbes keep transforming them over weeks, months, and years. Pu-erh from Yunnan is the best-known dark tea in the West. Hunan dark tea, including Fu brick, is its northern cousin with a gentler, woodier character.
Xinhua sits at the center of this tradition. Qujiang Bopian (渠江薄片), a pressed tea sent to the imperial court as tribute during the Tang dynasty, came from the Qujiang area on the border of Xinhua and Anhua and is often called the ancestor of Hunan dark tea.
What are the "golden flowers"?
The golden flowers are colonies of Eurotium cristatum (冠突散囊菌), a fungus that produces tiny yellow-gold spore bodies. When you pry open a good Fu brick, you see them scattered through the leaves like specks of gold dust. Tea makers have prized them for centuries: a dense, even bloom is the traditional sign of a well-made brick, and it gives Fu brick its distinctive clean, fungal fragrance (菌花香, "fungal-flower aroma").
Look closely at the broken brick: the golden specks are the "golden flowers."
Golden flowers vs. spoilage mold
- Golden flowers: small, distinct golden-yellow dots, evenly spread inside the brick; clean, sweet, mushroom-like smell
- Spoilage mold: fuzzy white, green, or black patches, often on the surface; musty or sour smell. Do not drink tea that looks or smells like this.
How is Fu brick tea made?
- Raw dark tea: mature tea leaves are withered, rolled, and piled to ferment, producing raw dark tea (黑毛茶).
- Steaming and pressing: the leaves are steamed to soften them and pressed into bricks, packed loosely enough for air to move inside.
- Flowering (发花, fa hua): the bricks rest for weeks in warm, humid rooms where conditions are carefully controlled so the golden flowers can grow throughout the brick.
- Slow drying: the bricks are dried slowly and then left to age.
The skill behind this process is officially recognized: Fu brick tea-making is part of China's national intangible cultural heritage, under "dark tea-making techniques."
A tea that traveled the Silk Road
For centuries, Hunan's dark tea was packed into bricks and carried by caravan to China's northwest and beyond along the old tea routes, where herding communities brewed it daily with milk and butter. Compressed bricks were practical: they were durable, easy to stack, and kept improving on the long journey. That is why Fu brick is sometimes called "Silk Road tea."
How to brew Fu brick tea
Gongfu style
Use about 5 g of tea per 100 ml of water at 95–100°C (just off the boil). Rinse the leaves once with hot water and discard it, then steep for 10–20 seconds and lengthen each infusion. A good Fu brick gives 8–10 infusions.
Long steep
Use about 5 g per 600 ml of water at 95°C and steep for up to 30 minutes. The tea stays smooth rather than bitter.
Simmered
The traditional way in Hunan and the northwest is to simmer the leaves in a kettle for a few minutes. It brings out a deeper, sweeter, more rounded cup, and is perfect for a cold day.
Breaking the brick
Use a tea knife or pick and work in from the edge along the layers, lifting off flakes rather than crushing the leaves.
How to store and age Fu brick tea
- Keep it in a dry, ventilated place at room temperature, away from sunlight
- Keep it away from strong odors such as spices, coffee, or perfume
- Do not refrigerate it; condensation invites unwanted mold
- A well-stored brick keeps mellowing for years; older bricks taste smoother and sweeter
How to choose a good Fu brick
- Golden flowers: plenty of small, even golden specks when you open the brick
- Aroma: clean, woody, and fungal, never musty or sour
- Origin: a named Hunan origin such as Xinhua or Anhua
- Vintage: a stated production year, so you know how long it has aged
Frequently asked questions
Is the mold in Fu brick tea safe?
The golden flowers are Eurotium cristatum, which develops naturally inside the brick during production and has been part of Fu brick tea for centuries. They look like small, even golden dots. Fuzzy white, green, or black patches with a musty smell are a different matter and mean the tea has spoiled.
What does Fu brick tea taste like?
Mellow, woody, and gently sweet, with a clean mushroom-like aroma. Aged bricks taste smoother and sweeter.
Is Fu brick tea the same as pu-erh?
No. Both are Chinese dark teas, but pu-erh comes from Yunnan, while Fu brick comes from Hunan and is defined by its golden flowers.
Does Fu brick tea have caffeine?
Yes. It is made from tea leaves, so it contains caffeine.
Where does Fu brick tea come from?
Hunan Province in China, especially the Xinhua and Anhua area, the historic heartland of Hunan dark tea.
About the author: Lisa Liao grew up in Xinhua, Hunan, and now lives in the San Francisco Bay Area. She holds China's national Level 1 Tea Artist certification (国家一级茶艺师), the highest level of the national tea-art qualification. She is the founder of ACHEA, a nonprofit that shares Chinese tea culture with communities in the US, and of ZorbTea. ZorbTea's Golden Flower Fu Brick Tea (GROUNDED) is a 2018 handcrafted Fu brick from Xinhua, produced by a USDA-certified organic producer (NOP ID 4087185003). For more Hunan traditions, read our guide to Huangjing, or see our FAQ.