Menghai County: The Capital of Blending and Its Cluster of Tea Factories

In the world of pu'er, the word "Menghai" stands at once for a place, a group of tea mountains, and a flavor. There are famous mountains here and countless tea factories, and the "Menghai style" tea drinkers talk about grew out of this land.

Where Is Menghai County?

Menghai County (勐海) is in the west of Xishuangbanna Dai Autonomous Prefecture, Yunnan. It borders Jinghong City to the east and Myanmar to the west and south, with a national border of 146.56 kilometers. The county covers about 5,369 square kilometers, had a population of about 353,700 in 2020, and its government is in Menghai Town.

The county has six towns, two townships, and three ethnic townships: Menghai Town, Daluo Town, Menghun Town, Mengzhe Town, Mengman Town, Meng'a Town, Mengsong Township, Mengwang Township, Gelanghe Hani Ethnic Township, Bulang Mountain Blang Ethnic Township, and Xiding Hani and Blang Ethnic Township.

According to 2022 statistics, the county had about 906,000 mu (905,956 mu) of tea under cultivation.

Which Townships in Menghai Grow Tea?

Nearly every township in Menghai has tea, with the ancient tea mountains concentrated in a few mountainous townships:

The flatland basins are where tea factories and modern gardens are concentrated. Further reading: Bulang Mountain, Nannuo Mountain, Hekai, Mengsong.

Why Does Menghai Have So Many Tea Factories?

In Menghai county town, signs for tea factories and primary processing workshops line the streets one after another, for several reasons:

1. Raw material is right there. Ancient tea mountains surround the town, and below them are large terrace gardens, so maocha reaches the factories without long-distance transport.

2. An early historical start. In 1938, Yunnan began promoting machine tea-making in southern Yunnan, and Bai Mengyu founded a tea experimental station on Nannuo Mountain; in 1940, Fan Hejun founded the Fohai Experimental Tea Factory in Menghai (then called Fohai). That factory resumed operation in the 1950s and was renamed the Menghai Tea Factory, training large numbers of tea-making professionals. The full story is in The Fohai Experimental Tea Factory and Dayi and the Menghai Tea Factory.

3. Ripe tea technology matured here. The usual account is that from 1973, the Menghai and Kunming tea factories began researching artificial pile fermentation (some sources record that Menghai Tea Factory had begun experimenting in the 1960s), and Menghai became an important producer of ripe tea. For the origins of ripe tea, see The Birth of Ripe Pu'er.

4. Fame draws clustering. As the pu'er market grew rapidly in the 2000s, many new factories and brands chose to settle in Menghai, close to raw material and to talent. In 2008, pu'er tea-making technique (Dayi tea-making technique) was added to China's national intangible cultural heritage list.

What Defines Menghai Blending

Menghai Tea Factory's classic recipes are mostly blends: material from different mountains, grades, and seasons mixed in set proportions so every batch tastes stable and consistent.

• Menghai large-leaf as the base: Menghai large-leaf tea, native to Nannuo Mountain, was listed as a national-level improved variety in the 1980s; with plump buds and leaves and a strong taste, it's the backbone of Menghai tea.
• Balancing strengths and weaknesses: Bulang Mountain's intensity, Nannuo Mountain's balance, and Mengsong's aroma complement one another.
• Recipe-code heritage: In codes like 7542, 7572, and 8582, the final "2" stands for Menghai Tea Factory, and the recipes are produced year after year, becoming benchmarks for comparison.
• Menghai style: Rich, full, and sweet after the bitterness, with ripe tea adding a layer of mellow sweetness.

Further reading: Pure Material vs. Blends, Menghai's Classic Recipe Codes.

Menghai's Climate and Tea Fermentation

Menghai has a climate with distinct wet and dry seasons. Based on 1981–2010 weather data:

• Temperature: The coldest month, January, averages about 12.9°C, and the hottest, June, about 23.1°C; it's mild year-round, without bitter cold or intense heat.
• Rainfall: Annual rainfall is about 1,318 millimeters, more than 80% of it falling from May to October; November through April is the dry season.
• Humidity: Monthly average relative humidity ranges from 65% to 86%, highest in the latter half of the rainy season.

For tea trees, the misty dry season and large day-night temperature swings mean spring buds grow slowly and build up plenty of inner substance, which is why spring tea is so rich.

For ripe tea fermentation, artificial pile fermentation depends on moist heat and microbes within the pile, and a warm, humid environment keeps microbes active. A common view in the tea world is that ripe tea pile-fermented in Menghai from the same maocha has a redder, brighter liquor and a more mellow, sweet taste, attributed to the local climate plus the microbial environment built up over years of fermentation in the factories. This is widely shared industry experience, but there isn't yet enough published research to prove it directly. Further reading: The Microbes in Wodui.

FAQ

Q: Why does Menghai County have so many tea factories?
A: Because it's surrounded by tea mountains with ample raw material; it had the Fohai Experimental Tea Factory as early as 1940, giving it a long tea-making history; ripe tea technology matured here in the 1970s; and brands clustered here as the pu'er market took off, so factories kept multiplying.

Q: What defines Menghai blending?
A: Using Menghai large-leaf as the base and mixing material from different mountains and grades in set proportions to achieve a stable, balanced, rich style, exemplified by classic recipe codes like 7542 and 7572.

Q: Is Menghai's climate related to ripe tea fermentation?
A: Menghai is warm with distinct wet and dry seasons, and the humid rainy season favors microbial activity during pile fermentation. The tea world widely believes ripe tea made in Menghai is especially mellow and sweet; this is an industry view based on experience.

Q: Which townships in Menghai County grow tea?
A: The ancient tea mountains are mainly in Bulang Mountain Township, Gelanghe Township, Menghun Town, Mengsong Township, Xiding Township, and Mengwang Township; flatland areas such as Menghai and Mengzhe are mostly tea factories and modern gardens.

Q: How big is Menghai County?
A: About 5,369 square kilometers, with a 2020 population of about 353,700, six towns, two townships, and three ethnic townships, and about 900,000 mu of tea under cultivation.