Nanhai Lü Chá

Nanhai Lü Chá (南海绿茶, Nánhǎi lǜchá) — “South Sea Green Tea” — green tea from Ding’an County (定安县, Dìng’ān Xiàn) in Hǎinán Province (海南省, Hǎinán Shěng), grown on volcanic soils (火山灰及火山石, huǒshān huī jí huǒshān shí) naturally enriched with selenium (硒, xī): Se content in soil is three times higher than the Chinese average, and in the finished tea reaches ≥0.8 mg/kg — compared to the norm for ordinary green tea of ≤0.3 mg/kg. Nanhai Lü Chá is the legacy of Nánhǎi Tea Factory (南海茶厂, Nánhǎi Cháchǎng, “South Sea Tea Factory”), founded in 1974 and by 1989 becoming one of the “five great tea factories of China” (中国五大茶场, Zhōngguó Wǔ Dà Cháchǎng): 20,000+ mu of gardens, 2,000+ tons of annual production, 24 million dollars in export revenue from red tea under the “Yuanyang” brand (远洋牌, Yuǎnyáng Pái). After the decline of 1990–2009, the factory was restructured and in 2016 became part of Hǎinán State Tea Group Wǔzhǐshān (海南省农垦五指山茶业集团, Hǎinán Shěng Nóngkěn Wǔzhǐshān Cháyè Jítuán). The modern brand is “Haiken” (海垦牌, Hǎikěn Pái).

1. Classification and Origin:

• Type: Green tea (绿茶, lǜchá), unfermented. By technology — pan-fired (炒青绿茶, chǎoqīng lǜchá). By shape — spiral (卷曲形, juǎnqū xíng) with down. Produced in three lines: Se-green premium (特级富硒绿茶, tèjí fù xī lǜchá) — single bud, Se ≥0.8 mg/kg, chestnut aroma; high-aromatic (高香绿茶, gāoxiāng lǜchá) — from Qilan and Huangguanyin cultivars, floral profile; traditional (传统炒青, chuántǒng chǎoqīng) — mass market, for daily consumption and packaging.

• Category: Product of Geographical Indication of the PRC (国家地理标志保护产品). Former “big five tea factories of China” (中国五大茶场, 1989). Special prize “Zhong Cha Bei” (中茶杯特等奖, 2017). Prize of China International Tea Expo (中国国际茶业博览会优质奖, 2018). Part of Wǔzhǐshān Group (海垦).

• Origin: China, Hǎinán Province (海南省, Hǎinán Shěng), Ding’an County (定安县, Dìng’ān Xiàn). Hainan is China’s southernmost tea province (18–20° N), the country’s only tropical tea region. The Nánhǎi Tea Gardens (南海茶园, Nánhǎi Cháyuán) are located in the volcanic Se-belt — a zone of volcanic ash and lava distribution, forming soils with abnormally high selenium content.

• Geographic coordinates: Approximately 19°30′–19°45′ N, 110°10′–110°25′ E. Elevation — 50–200 m above sea level.

2. History and Cultural Significance:

• Prehistory: Hainan’s tea roots. Hainan possesses a long, though little-known tea history. The Lì people (黎族, Lízú), indigenous inhabitants of the island, used wild tea (Camellia sinensis var. assamica) from the Wǔzhǐshān (五指山) forests as medicine long before organized tea cultivation. In 1920, the “Report on Industrial Survey of Qiongya” (《调查琼崖实业报告书》) noted that wild tea from the five-finger mountains “was not inferior to Longjing in color,” but locals did not master the technique of processing it. Industrial tea cultivation on the island began only in the late 1950s, when state agricultural administrations (农垦, nóngkěn) created bases for red tea production for export.

• 1974 — founding of Nanhai Tea Factory. The South Sea Tea Factory was founded in Ding’an County in 1974 as part of a state program to expand Hainan tea production. The first harvest was obtained in 1976. The factory specialized in CTC red tea (红碎茶, hóng suì chá) for export, produced under the “Yuanyang” brand (远洋牌, literally “Ocean Brand”).

• 1989 — peak: “Five Great Tea Factories.” By the end of the 1980s, Nanhai Tea Factory reached impressive scale: over 20,000 mu (≈1333 ha) of tea gardens, more than 2,000 tons of annual production, red tea exports to 18 countries — USA, New Zealand, Japan, France, Singapore and others. Total export revenue was 24 million dollars. The factory entered the number of “five great tea factories of China” — alongside several other largest state tea enterprises in the country. Overall, Hainan state tea cultivation by 1990 had cumulatively produced 63,600 tons of dry tea, of which 40,000+ tons were exported, bringing more than 70 million yuan in foreign exchange earnings.

• 1990–2009 — decline. Reform of China’s foreign trade system in the mid-1990s eliminated centralized procurement. Red tea exports were effectively blocked — world prices fell, and domestic demand in China gravitated toward green tea and oolong. Nanhai tea gardens were partially abandoned, production decreased dozens of times.

• 2010 — revival. Beginning of new strategy: reorientation from red tea to Se-enriched green tea, utilizing the unique advantage of volcanic soils. High-aromatic cultivars from Fujian were introduced — Qílán (奇兰, Qílán) and Huángguānyīn (黄观音, Huángguānyīn) — which brought floral profile to the traditionally “chestnut” line. In 2016, the factory became part of Wuzhishan Group. In 2017 — special prize “Zhong Cha Bei.” In 2018 — international prize. By 2024 — 1,000+ mu of gardens, about 50 tons of annual production, passing 481 quality control parameters according to EU standards.

• Cultural significance. Hainan is an island whose tea heritage long remained in the shadow of Yunnan, Fujian and Zhejiang. Nanhai Lü Cha embodies a combination rare for Chinese tea: tropical climate, volcanic geology and Se-enrichment. In the broader context of Hainan culture, tea organically fits into the tradition of “laoba cha” (老爸茶, lǎobà chá) — leisurely tea drinking in open teahouses, characteristic of the island’s daily life.

3. Botanical Description and Raw Material:

• Cultivars: For Nanhai Lü Cha production, medium-leaf and small-leaf varieties of Camellia sinensis var. sinensis are used, selected for resistance to heat and high humidity of tropical climate:

  • Qílán Chá (奇兰茶, Qílán Chá) — “Miraculous Orchid,” high-aromatic Fujian cultivar. Provides pronounced floral tone (兰花香, lánhuāxiāng) in the “high-aromatic green” line.
  • Huángguānyīn (黄观音, Huángguānyīn) — “Yellow Guanyin,” hybrid developed in Fujian. Brings sweet floral aroma with honeysuckle notes.
  • Fúdǐng Dàbái Chá (福鼎大白茶, Fúdǐng Dàbái Chá) — classic universal variety, providing even, sweetish base profile. Main variety for Se-line. All varieties are clonal, vegetatively propagated, adapted to Hainan’s tropical conditions.

• Picking standard and grades:

  • Premium Sè (特级富硒): Single bud (单芽), dense, with down. Se ≥0.8 mg/kg. Chestnut aroma. From 800 yuan/500 g.
  • First (一级): One bud + one leaf (一芽一叶). 300–500 yuan/500 g.
  • Second (二级): One bud + two leaves (一芽二叶). Mass market, used for bagged tea.

• Seasons: Thanks to Hainan’s tropical climate, tea bushes vegetate year-round. Picking is possible 10–11 months per year. Early spring Hainan tea reaches market in January — two to three months earlier than in other Chinese provinces, allowing positioning as “first spring tea of the year” (华夏第一早春茶). Spring picking (1–3 month) — highest quality; summer and autumn — for mass lines.

4. Terroir and Cultivation:

• Climate: Tropical monsoon (热带季风气候, rèdài jìfēng qìhòu). Average annual temperature — 22–25°C. Annual precipitation — about 2200 mm. Cloud cover — over 260 days per year — one of the highest indicators among China’s tea regions. Diffused light comprises more than 75% of total light flow. Long summer without frost, short dry season. Tea bushes do not enter winter dormancy, ensuring year-round vegetation and high productivity.

• Soils: Volcanic — developed on substrate of volcanic ash and lava (火山灰及火山石发育). Acidic (pH 5.0–5.5). Naturally enriched with selenium (Se) — content three times higher than Chinese average. Volcanic origin provides rich mineral profile: besides Se, elevated content of potassium, magnesium, iron and a range of trace elements. Soils are porous, with good drainage — excess tropical precipitation does not cause water stagnation.

• Ecology: Forest cover in tea garden zone — 86% — one of the highest indicators among China’s tea regions. Water resources — 1st class purity. Chemical pesticides completely prohibited. Management — organic. Production passes control for 481 parameters in accordance with EU requirements.

5. Production Technology:

Nanhai Lü Cha technology is classic pan-firing (炒青, chǎoqīng), adapted to tropical raw material. Key principle — “high temperature locks aroma” (高温锁香, gāowēn suǒ xiāng): rapid fixation at high temperature with subsequent immediate cooling for maximum preservation of volatile aromatic compounds.

• Spreading (摊青, tān qīng): 4–6 hours in ventilated room. Evaporation of surface moisture, beginning of aromatic precursor formation.

• Kill-green (杀青, shā qīng): Rotary drum, temperature — 160–180°C. Rapid fixation — enzyme inactivation, oxidation prevention. Immediately after fixation — rapid cooling to prevent thermal damage to tender buds and loss of volatile aromas.

• Rolling (揉捻, róuniǎn): Light, into strips (条形). Cell wall breakdown, initial shape formation.

• Secondary drying (烘二青, hōng èr qīng): Intermediate drying, moisture reduction to stable level.

• Shaping / “strip arrangement” (理条, lǐ tiáo): Final spiral shape formation (卷曲形). Use of shaping machines.

• “Down raising” (提毫, tí háo): Special stage aimed at “revealing” white down (白毫) on tea particle surface. Down is indicator of raw material tenderness and one of visual quality markers.

• Final drying (足干, zú gān): Bringing moisture to ≤6%. Shape stabilization, aroma fixation.

6. Organoleptic Characteristics:

• Dry leaf appearance: Dense, thin spirals (条索紧细卷曲, tiáosuǒ jǐn xì juǎnqū). Emerald-green with oily luster, covered with noticeable white down (翠绿油润显毫, cuìlǜ yóurùn xiǎn háo). Even, uniform.

• Dry leaf aroma: Clean (清香, qīngxiāng) with chestnut tone (栗香) in spring Se-tea. In Qilan and Huangguanyin varieties — pronounced floral tone (花香, huāxiāng) with orchid and honeysuckle notes.

• Liquor aroma: High, persistent. Chestnut — in Se-line. Floral — in high-aromatic. Cold cup aroma persists over 8 minutes — indicator of exceptional persistence of aromatic compounds, characteristic of tropical raw material with high essential oil content.

• Taste: Fresh and brisk (鲜爽, xiānshuǎng). Sweet and mellow (甘醇, gānchún). Minimal astringency — noticeably lower than green teas from more northern provinces. Returning sweetness (回甘) distinct and prolonged. Liquor body — medium, with silky texture.

• Liquor color: Yellow-green, clear and bright (黄绿清亮, huánglǜ qīng liàng).

• Spent leaves: Tender, gathered in “bouquets” (成朵, chéng duǒ), yellow-green, “alive” — leaves retain elasticity and freshness (嫩匀成朵，黄绿鲜活).

7. Chemical Composition:

• Selenium (硒, xī): ≥0.8 mg/kg in finished tea — 2.5+ times higher than ordinary green tea (≤0.3 mg/kg). Selenium comes from volcanic soils through tea bush root system and accumulates in young shoots. Main form of Se in tea — organic selenium (selenomethionine, selenocysteine), which has high bioavailability. This is the key unique feature of Nanhai Lü Cha, determining its positioning as “functional” green tea.

• Polyphenols (茶多酚): ≥25%. Tropical climate with high insolation stimulates polyphenol synthesis in leaf.

• Amino acids (氨基酸): ≥3.5%. Including L-theanine — main component of “freshness” (鲜爽). Tropical conditions are less favorable for amino acid accumulation compared to northern provinces, however 3.5% is worthy for tropical green tea.

• Caffeine (咖啡碱): Typical content for green tea — 3.0–4.5%. Tropical origin and rapid vegetative mass growth may increase caffeine content.

• Vitamins: Vitamin C (ascorbic acid) — tropical raw material has elevated content. B vitamins, vitamin E.

• Minerals: Besides selenium — potassium, magnesium, iron, zinc, manganese. Volcanic substrate provides wide spectrum of trace elements.

• Essential oils: Elevated content — consequence of tropical climate and year-round vegetation. High-boiling terpene compounds form persistent aroma (cold cup >8 minutes).

8. Health Properties:

• Se-antioxidant protection. Organic selenium (≥0.8 mg/kg) — cofactor of glutathione peroxidase, one of key enzymes of body’s antioxidant system. Combined action of Se and tea polyphenols creates synergistic antioxidant effect.

• Thyroid support. Selenium is necessary for deiodinase synthesis — enzymes converting thyroxine (T4) to active triiodothyronine (T3). Regular consumption of Se-enriched tea supports normal thyroid function.

• Immunomodulation. Selenium enhances cellular immune response, increasing activity of NK-cells (natural killers) and T-lymphocytes.

• Polyphenol antioxidant action. Catechins (≥25% polyphenols) neutralize free radicals, protect cell membranes and DNA from oxidative damage.

• Tonic effect. Caffeine combined with L-theanine provides mild, sustained stimulation — improved concentration without “nervous” excitement.

• Lipid metabolism support. Tea polyphenols participate in regulating LDL cholesterol and triglyceride levels.

• Cardioprotection. Selenium combined with polyphenols has protective effect on cardiovascular system, reducing risk of oxidative damage to vascular wall.

• Cognitive function support. L-theanine promotes brain α-wave generation, improving attention and working memory.

9. Brewing:

• Water temperature: 80–85°C for first and second grades. For premium Se-grade (single buds) — 75°C — lower temperature prevents “scalding” tender buds and allows fuller sweetness development.

• Tea amount: 3 g per 150 ml (1:50 ratio).

• Teaware: Glass tumbler — for observing spiral unfurling. Thin-walled gaiwan (薄胎盖碗) — for precise extraction control. Porcelain cup with lid.

• Process:

  1. Warm teaware with hot water, drain.
  2. Add tea.
  3. Use “middle pour method” (中投法): pour 1/3 volume water, swirl, let tea particles wet, then fill to full volume.
  4. First infusion — 15–20 seconds.
  5. Pour out liquor.
  6. Repeat brewings — 3 infusions, each subsequent — +10–15 seconds. Tropical raw material extracts faster than northern, so steeping time is shorter.

10. Storage:

• Main storage: Airtight packaging (aluminum bag, vacuum air extraction), refrigerator 0–5°C. Term — up to 12 months.

• Tea enemies: Moisture (especially relevant for tropical climate — when storing in Hainan, air-conditioned room mandatory), foreign odors, light, high temperature, oxygen.

• Recommendation: Hainan green tea is recommended for fresh consumption — within 6 months after production. Tropical raw material is less stable for long-term storage compared to northern green teas.

11. Price and Counterfeits:

• Price category: Premium Se-grade (特级富硒) — from 800 yuan/500 g (≈$110+). First grade (高香绿茶) — 300–500 yuan/500 g. Second grade (传统炒青) — from 100 yuan/500 g. Compared to other famous Hainan tea — Baisha Lü Chá (白沙绿茶) — Nanhai Lü Cha is positioned in comparable price category, but with emphasis on Se-enrichment.

• How to avoid counterfeits:

  • Labeling. Authentic tea is marked with geographical indication sign “南海绿茶” and/or “海垦牌” (Haiken) brand. Presence of Se-content certificate.
  • Shape. Dense spirals with down, emerald-green. Not crumbly, not yellow.
  • Aroma. Clean, chestnut (Se-line) or floral (Qilan/Huangguanyin). Absence of burnt, sour smell.
  • Liquor. Yellow-green, bright. Turbid or dark liquor — sign of counterfeit.
  • Price. Premium Se-tea cannot cost less than 500 yuan/500 g. Cheap “Se-green tea” without certificate — probable counterfeit.

12. Interesting Facts:

• Volcanic Se — triple concentration. Nanhai tea garden soils formed from volcanic ash and lava — rarest substrate type for tea regions. Se content in soil — three times higher than Chinese average. For comparison: another famous Se-tea region — Ānkāng (安康) in Shaanxi — also Se-enriched, but from sedimentary rocks, not volcanic.

• “Five Great Tea Factories” (1989). At peak, Nanhai Tea Factory processed 20,000+ mu gardens and produced 2,000+ tons tea annually. “Yuanyang” brand red tea exported to 18 countries and brought 24 million dollars foreign exchange earnings. Factory fate — from greatness to oblivion and back — repeats dramatic history of all Hainan tea cultivation.

• 260+ days cloudiness. Ding’an — one of China’s most “cloudy” tea regions: more than 260 days yearly sky covered with clouds. For comparison: Méngdǐngshān (蒙顶山) in Sichuan — about 280 days, but Mengding cloudiness is fog and rain, while Ding’an’s is tropical vapor and high cumulus clouds, providing soft diffused light without overheating.

• 86% forest. Forest cover of tea garden territory — 86%, one of highest indicators among all Chinese tea regions. Forest ecosystem supports biodiversity, microclimate and natural pest protection.

• Qilan — “Miraculous Orchid.” Introduction of Fujian high-aromatic Qilan variety to Hainan volcanic soil — 2010s experiment that brought bright floral profile to traditionally “chestnut” Se-line and created principally new type of green tea for Hainan.

13. Comparison with Other Green Teas:

• Baisha Lü Chá (白沙绿茶, Báishā Lǜchá). Also Hainan green tea with geographical indication. Baisha — from western part of island, from unique meteorite crater soils (陨石坑); Nanhai — from central part, from volcanic soils. Both enriched with rare trace elements, but Nanhai — purposefully Se-tea, while Baisha — “crater” tea without Se emphasis. Baisha more promoted on domestic market.

• Ankang Se-enriched green tea (安康富硒绿茶, Ānkāng Fù-Xī Lǜchá). From Shaanxi Province, also Se-enriched. Ankang Se — from sedimentary rocks, Nanhai — from volcanic. Ankang tea — from northern subtropical belt (elevated amino acids, more “fresh” profile); Nanhai — from tropics (elevated polyphenols, more “dense” profile). Different geologies give different mineral spectrum.

• Ēnshī Yù Lú (恩施玉露, Ēnshī Yùlù). From Hubei Province, also grown on Se-enriched soils. Enshi Yu Lu — steamed green tea (蒸青, zhēngqīng), Nanhai Lü Cha — pan-fired (炒青). Radically different technologies with common Se-theme: Enshi Yu Lu preserves more chlorophyll and has “marine” umami profile, Nanhai — chestnut or floral pan-firing profile.

• Shuiman Lü Chá (水满绿茶, Shuǐmǎn Lǜchá). Hǎinán green tea from Shuǐmǎn village (水满乡) in Wuzhishan County. Shuiman — from wild Hainan large-leaf variety (C. sinensis var. assamica), mountain (500–800 m); Nanhai — from introduced medium-leaf cultivars, low-mountain (50–200 m). Shuiman — more “wild,” with pronounced astringency; Nanhai — more “cultured,” with emphasis on sweetness and Se.

In Conclusion:

Nanhai Lü Cha — tea whose selenium came from volcano: soils from ash and lava, Se-enriched three times above norm, give tea with ≥0.8 mg/kg organic selenium — formula for those who value not only taste, but microelement power of each cup. Behind this formula — history of “five great factories,” 24 million dollars export, decade of decline, 2010s revival and tropical cloudiness 260 days yearly. Nanhai Lü Cha — one of few Chinese green teas where geology determines identity: not altitude, not ancient bushes, not master’s name, but volcano fire transformed into selenium, selenium — into health, health — into cup.