Herb Flower (花 huā)

Mei Gui Qie

Roselle calyx · 玫瑰茄

Hibiscus sabdariffa L. · Calyx Hibisci Sabdariffae

Also known as: Luò Shén Huā (洛神花), Roselle, Hibiscus tea flower,

Mei Gui Qie (Roselle calyx) plant

Images shown are for educational purposes only

Roselle calyx (also known as Luò Shén Huā or hibiscus flower) is the dried, deep-red calyx of a tropical plant widely enjoyed as a tart herbal tea. It is cooling and sour, making it popular for clearing summer heat, quenching thirst, and supporting healthy blood pressure. Modern research strongly supports its traditional use for cardiovascular health, particularly in helping to manage mild high blood pressure and cholesterol.

Category Heat-clearing herbs Herbs that relieve coughing and wheezing (止咳平喘药)
Therapeutic focus Cardiovascular Health Blood Pressure Support Summer Heat Relief Digestive Health

TCM Properties

Temperature

Cool

Taste

Sour (酸 suān)

Channels entered

Kidneys, Liver

Parts used

Flower (花 huā)

Educational content • Consult qualified TCM practitioners for diagnosis and treatment

What This Herb Does

Every herb has a specific set of actions — here's what Mei Gui Qie does in the body, explained in both everyday and TCM terms

Therapeutic focus

In practical terms, Mei Gui Qie is primarily used to support these areas of health:

Cardiovascular Health Blood Pressure Support Summer Heat Relief Digestive Health

TCM Actions

In TCM terminology, these are the specific therapeutic actions that Mei Gui Qie performs to restore balance in the body:

Clears Heat and Resolves Summer-Heat Astringes the Lungs and Stops Cough Generates Fluids and Relieves Thirst Promotes Urination and Reduces Edema Lowers Blood Pressure Relieves Alcohol Toxicity

How these actions work

'Clears Heat and relieves summer-heat' means Méi Guī Qié helps cool the body when it has been affected by hot weather or internal Heat. Its cool nature and sour taste make it especially useful in summer, when people feel overheated, thirsty, irritable, or dizzy from the heat. It is commonly brewed as a refreshing tea to relieve these symptoms.

'Restrains the Lungs and stops coughing' refers to the herb's sour taste, which has a natural astringing (tightening) effect. In TCM, sour-tasting substances can help gather and hold things in place. For the Lungs, this means it can reduce a chronic, weak cough caused by the Lungs not holding their Qi properly, a situation sometimes described as Lung deficiency cough.

'Generates fluids and relieves thirst' means the sour taste stimulates saliva and body fluid production. This is why roselle tea feels so refreshing when you drink it on a hot day. It is well suited for people who are dehydrated or parched from summer heat.

'Promotes urination and reduces edema' means this herb gently encourages the body to pass more urine, helping to reduce water retention and puffiness. Its affinity for the Kidney channel supports the body's water metabolism.

'Lowers blood pressure' is an action recognized in both TCM folk practice and modern research. In TCM terms, this relates to the herb's ability to clear Liver Heat and calm rising Liver Yang, which is a common pattern underlying high blood pressure. Modern clinical trials have confirmed this blood-pressure-lowering effect.

'Relieves alcohol intoxication' means Méi Guī Qié can help the body recover from excess alcohol consumption. Its cooling and fluid-generating properties help counter the Damp-Heat that alcohol creates in the body.

Patterns Addressed

In TCM, symptoms cluster into recognizable patterns of disharmony. Mei Gui Qie is used to help correct these specific patterns.

Why Mei Gui Qie addresses this pattern

Méi Guī Qié's cool nature and sour taste directly counteract the pathogenic Summer-Heat that invades the body during hot weather. Summer-Heat is a Yang pathogen that injures Qi and body fluids, causing thirst, irritability, and fatigue. The herb clears this Heat while its sour taste generates fluids, replenishing what the Heat has consumed. Its affinity for the Kidney channel supports the body's water metabolism, which Summer-Heat tends to disrupt.

A practitioner would look for one or more of these signs

Excessive Thirst

Intense thirst from heat exposure

Irritability

Restlessness and irritability in hot weather

Eye Fatigue

Fatigue from summer heat and fluid loss

Dark Urine

Scanty, dark urine

Commonly Used For

These are conditions where Mei Gui Qie is frequently used — but only when they arise from the specific patterns it addresses, not in all cases

Arises from: Liver Fire Blazing

TCM Interpretation

In TCM, high blood pressure is most often understood as a condition of excess rising upward in the body. The Liver is the organ most associated with this upward surging pattern. When the Liver generates excess Heat (Liver Fire) or when Liver Yang rises unchecked due to underlying Yin deficiency, symptoms like headache, dizziness, red face, and elevated blood pressure develop. The condition often worsens with stress, anger, or a diet rich in alcohol and greasy foods, all of which generate Heat in the Liver.

Why Mei Gui Qie Helps

Méi Guī Qié's cool nature directly clears the excess Heat from the Liver, while its sour taste has a natural astringent and restraining quality that checks the upward surging of Liver Yang. By entering the Liver channel, it works precisely where the problem originates. Multiple meta-analyses of randomized controlled trials have confirmed that regular consumption of roselle tea significantly lowers systolic blood pressure, with some studies showing reductions comparable to standard antihypertensive medications in patients with mild to moderate hypertension.

Also commonly used for

Chronic Coughing

Chronic weak cough from Lung deficiency

Edema

Mild water retention and puffiness

Indigestion

Poor appetite and sluggish digestion

Heat Stroke

Sunstroke and summer-heat symptoms

Urinary Tract Infection

Used as a supportive remedy in some traditions

Herb Properties

Every herb has an inherent temperature, taste, and affinity for specific channels — these properties determine how it interacts with the body

Temperature

Cool

Taste

Sour (酸 suān)

Channels Entered

Kidneys Liver

Parts Used

Flower (花 huā)

Dosage & Preparation

These are general dosage guidelines for Mei Gui Qie — always follow your practitioner's recommendation, as dosages vary based on the formula and your individual condition

Standard dosage

9-15g

Maximum dosage

Up to 15g in decoction for standard therapeutic use. As a food-grade tea, higher quantities are commonly consumed in beverage form, but therapeutic doses above 15g daily should be used with practitioner guidance.

Dosage notes

For general cooling and thirst-quenching purposes (as summer tea), 3-5g of dried calyces steeped in boiling water is sufficient. For therapeutic use addressing blood pressure or cough, the standard decoction dose of 9-15g applies. The herb can also be taken as a cold infusion or prepared into beverages. Because of its high acidity, people with sensitive stomachs may wish to start at lower doses. Combining with a small amount of honey or rock sugar can soften the tartness and reduce gastric irritation.

Preparation

No special decoction handling required. The dried calyces can be decocted normally or simply steeped in boiling water as a tea infusion. For tea preparation, steeping for 5-10 minutes produces a tart, ruby-red drink.

Common Herb Pairs

These ingredients are traditionally combined with Mei Gui Qie for enhanced therapeutic effect

Shan Zha
Shan Zha 1:2 (Méi Guī Qié 3g : Shān Zhā 6g)

Méi Guī Qié and Shān Zhā (hawthorn berry) together enhance digestion and support cardiovascular health. Shān Zhā invigorates Blood and dissolves food stagnation while Méi Guī Qié clears Heat and generates fluids. Together they address bloating, poor appetite, and elevated blood lipids more effectively than either alone.

When to use: When digestive sluggishness is accompanied by Heat signs such as thirst and irritability, or when the goal is to support healthy blood lipid levels and weight management.

Jue Ming Zi
Jue Ming Zi 1:2 (Méi Guī Qié 5g : Jué Míng Zǐ 10g)

Méi Guī Qié and Jué Míng Zǐ (cassia seed) both clear Liver Heat and lower blood pressure. Jué Míng Zǐ specifically clears Liver Fire, brightens the eyes, and moistens the intestines. Together they have a stronger effect on calming Liver Yang, reducing blood pressure, and addressing Heat-related eye redness and headache.

When to use: When high blood pressure is accompanied by red eyes, headache, and constipation from Liver Fire, often used together as a daily health tea.

Ju Hua
Ju Hua 1:1 (Méi Guī Qié 3-5g : Jú Huā 3-5g)

Méi Guī Qié and Jú Huā (chrysanthemum flower) both have a cooling nature and clear Heat from the Liver. Jú Huā disperses Wind-Heat and clears the eyes, while Méi Guī Qié generates fluids and lowers blood pressure. Their combined cooling and Liver-clearing actions are stronger than either herb alone.

When to use: When Liver Fire or Liver Yang rising causes headache, red irritated eyes, and elevated blood pressure, commonly brewed together as a cooling summer tea.

Comparable Ingredients

These ingredients have overlapping uses — here's how to tell them apart

Wu Mei
Mei Gui Qie vs Wu Mei

Both are sour in taste and can restrain the Lungs to stop coughing. However, Wū Méi (smoked plum) is warmer, more strongly astringent, and better at generating fluids for chronic Lung deficiency cough, stopping diarrhea, and calming roundworms. Méi Guī Qié is cooler and better suited when Heat is present alongside the cough, and has the additional benefit of lowering blood pressure and clearing summer-heat.

Xia Ku Cao
Mei Gui Qie vs Xia Ku Cao

Both clear Liver Heat and are used for hypertension from Liver Fire. However, Xià Kū Cǎo (prunella spike) is more strongly focused on clearing Liver Fire and resolving hard nodules and swollen lymph nodes, while Méi Guī Qié is milder, more pleasant-tasting, generates fluids, and is better suited as a daily beverage for gentle blood pressure support.

Common Substitutes & Adulterants

Related species and common adulterations to be aware of when sourcing Mei Gui Qie

Mei Gui Qie (Hibiscus sabdariffa) may be confused with other Hibiscus species, most notably Hibiscus rosa-sinensis (Chinese hibiscus/Fu Sang Hua), which has very different properties and is mainly ornamental. Commercial hibiscus tea products sometimes contain H. rosa-sinensis, which is less studied medicinally. The authentic Mei Gui Qie calyx is distinguished by its thick, fleshy texture, deep crimson colour, and strongly sour taste. Hibiscus cannabinus (kenaf) is a closely related species sometimes grown alongside roselle for fibre production, and its calyces should not be substituted.

Educational content — always consult a qualified healthcare provider or TCM practitioner before using any herb.

Toxicity Classification

Classical Chinese pharmacopoeia toxicity rating for Mei Gui Qie

Non-toxic

Mei Gui Qie is generally recognized as safe (GRAS) as a food ingredient by the U.S. FDA. It is widely consumed worldwide as a beverage (hibiscus tea) with no reports of significant toxicity at normal dietary doses. The main concern at excessive intake is gastrointestinal discomfort due to the high organic acid content (citric, malic, and hibiscus acids). Very high doses in animal studies have shown a minor, clinically insignificant increase in aspartate aminotransferase (a liver enzyme marker), but no elevated risk of adverse events has been observed at standard dosages in human trials.

Contraindications

Situations where Mei Gui Qie should not be used or requires extra caution

Caution

People with excess stomach acid or gastric ulcers should avoid this herb, as its high organic acid content (citric acid, malic acid, hibiscus acid) can aggravate acid-related stomach conditions.

Caution

People taking antihypertensive medications should use with caution, as Mei Gui Qie has demonstrated blood-pressure-lowering effects that may compound the effects of these drugs, potentially causing hypotension.

Caution

People with Spleen-Stomach deficiency cold patterns (marked by cold limbs, loose stools, poor appetite) should use with caution, as the herb is cool in nature and sour in taste, which may further weaken the digestive system.

Caution

People taking diabetes medications should use with caution. Mei Gui Qie may lower blood glucose, and combined use could cause hypoglycemia.

Avoid

Pregnant women should avoid use. Hibiscus sabdariffa may stimulate menstruation or have emmenagogue effects that could theoretically endanger pregnancy. Animal studies have raised reproductive safety concerns.

Special Populations

Important considerations for pregnancy, breastfeeding, and pediatric use

Pregnancy

Use during pregnancy is not recommended. According to multiple safety reviews, sufficient clinical data on the safety of Hibiscus sabdariffa in pregnancy is lacking. WebMD classifies it as "possibly unsafe" during pregnancy, noting it might stimulate menstruation or have effects that could threaten a pregnancy. An animal study found that maternal exposure to H. sabdariffa extract adversely influenced male reproductive development in rat offspring. The Egyptian Herbal Monograph also states that safety during pregnancy has not been established and use is not recommended. Women who are pregnant or planning pregnancy should avoid therapeutic doses of this herb.

Breastfeeding

No data exist on the excretion of Hibiscus sabdariffa components into breastmilk or on its safety in breastfeeding mothers and infants, according to the LactMed database (NCBI). Hibiscus is classified as GRAS as a food by the U.S. FDA, and is traditionally used as a galactogogue (to promote milk production) in parts of West Africa and Nigeria. However, the lactogenic effect has only been demonstrated in animal studies and no rigorous human clinical trials confirm safety or efficacy during breastfeeding. Caution is advised, particularly at doses higher than those typically found in food.

Children

No specific paediatric safety data are available. As a food-grade herb widely consumed as a beverage, it is generally considered mild. For children, dosage should be reduced proportionally to body weight. Given its high organic acid content and cool nature, large amounts should be avoided in young children, especially those with sensitive stomachs or poor digestion. Use in children under 2 years of age has not been studied.

Drug Interactions

If you are taking pharmaceutical medications, be aware of these potential interactions with Mei Gui Qie

Antihypertensive medications: Mei Gui Qie has demonstrated blood-pressure-lowering effects in multiple clinical trials. Concurrent use with antihypertensive drugs (ACE inhibitors, calcium channel blockers, diuretics) may cause additive hypotensive effects. Blood pressure should be monitored.

Chloroquine: Studies in healthy volunteers have shown that Hibiscus sabdariffa alters the pharmacokinetics of chloroquine, potentially reducing its effectiveness. This is particularly relevant in tropical regions where chloroquine is used for malaria.

Acetaminophen (paracetamol): H. sabdariffa has been shown to alter acetaminophen pharmacokinetics in human volunteer studies, though the clinical significance is not fully established.

Diclofenac: Similar pharmacokinetic interactions have been demonstrated with diclofenac (an NSAID).

Diabetes medications: Because roselle may lower blood glucose, concurrent use with hypoglycaemic agents or insulin may increase the risk of hypoglycaemia. Blood glucose should be monitored closely.

Digoxin assay interference: Hibiscus tea has been shown to interfere with the electrochemiluminescent immunoassay method for measuring serum digoxin levels, potentially producing false-positive results. This is a laboratory interaction rather than a pharmacological one.

Dietary Advice

Foods and dietary considerations when taking Mei Gui Qie

Avoid consuming on an empty stomach, as the high organic acid content may irritate the gastric lining. A small amount of honey or rock sugar can be added to reduce tartness and protect the stomach. People with cold constitutions or weak digestion should pair with warming foods (such as ginger or dates) rather than consuming large quantities of cold-brewed roselle tea. Avoid combining with excessively cold or raw foods if using for respiratory conditions.

Botanical Description

Physical characteristics and morphology of the Mei Gui Qie source plant

Mei Gui Qie (Hibiscus sabdariffa L.) is an annual or short-lived perennial herb in the Malvaceae (mallow) family, growing 1 to 2.5 meters tall. The stems are pale purple to reddish. The lower leaves are ovate and undivided, while the upper leaves are deeply palmately three-lobed with serrated edges. Flowers are solitary in the leaf axils, 6 to 10 cm in diameter, with pale yellow to white petals that have a dark red spot at the base. The plant is most prized for its fleshy, crimson-red calyces and small bracts (known as "epicalyx"), which enlarge and become deeply coloured as the fruit matures. The fruit is an ovoid capsule, densely covered in fine hairs, containing kidney-shaped seeds.

In bloom, the combination of purple stems, green leaves, yellow flowers, and red calyces is strikingly colourful, earning Mei Gui Qie the nickname "plant ruby" (植物红宝石). The name "Mei Gui Qie" (literally "rose eggplant") comes from the dried calyx's shrivelled appearance, which resembles a wilted rose. The plant thrives in tropical and subtropical regions, preferring warm, sunny conditions with well-drained sandy loam soil. It is a short-day plant that flowers when day length drops below about 13 hours.

Sourcing & Harvesting

Where Mei Gui Qie is sourced, when it's harvested or collected, and how to assess quality

Harvesting season

Late autumn (October to December), when the calyces turn bright red and become fleshy after flowering. In southern China, flowering typically begins in September under short-day conditions, with calyx harvest occurring in batches from October onward.

Primary growing regions

Originally from West Africa (Sudan region), where it has been cultivated for thousands of years. Introduced to China in the 1940s, first to Fujian province. Now cultivated across southern China including Fujian, Taiwan, Guangdong, Guangxi, Hainan, and Yunnan. China and Thailand are among the world's largest producers. Sudan and Nigeria are noted for producing some of the world's best quality roselle. In China, Guangxi and Fujian are key production areas.

Quality indicators

Good quality dried Mei Gui Qie calyces should be deep purplish-red in colour, with thick, fleshy calyx segments that feel slightly leathery (soft, pliable leather texture). They should have a mild, pleasant sour fragrance. When steeped in hot water, high-quality calyces produce a vivid ruby-red infusion with a distinctly tart, cranberry-like taste. Avoid calyces that are brownish or dull in colour (indicating age or poor drying), overly brittle, or lacking aroma. The eight to twelve small bracts at the base should still be visible and intact.

Classical Texts

Key passages from the classical Chinese medical texts that describe Mei Gui Qie and its therapeutic uses

Mei Gui Qie is a relatively recent introduction to Chinese materia medica, first documented in the Lingnan Nongkan (《岭南农刊》, Lingnan Agricultural Journal). As such, it does not appear in the ancient classical texts (Shen Nong Ben Cao Jing, Ben Cao Gang Mu, etc.).

《新华本草纲要》(Xinhua Bencao Gangyao): Records that the root and seeds of Mei Gui Qie have diuretic and strengthening (强壮) functions.

《中华本草》(Zhonghua Bencao):
Chinese: 味酸，性凉。归肾经。敛肺止咳，降血压，解酒。主治肺虚咳嗽，高血压，醉酒。
English: "Sour in taste, cool in nature. Enters the Kidney channel. Restrains the Lung and stops cough, lowers blood pressure, and counteracts alcohol intoxication. Indicated for cough from Lung deficiency, hypertension, and alcohol intoxication."

Historical Context

The history and evolution of Mei Gui Qie's use in Chinese medicine over the centuries

Mei Gui Qie (玫瑰茄) is unusual among Chinese medicinal herbs in that it has no ancient classical pedigree. Originally domesticated in Africa, possibly in the region of modern Sudan, as early as 4000 BCE, it spread to Asia and the Americas between the 16th and 20th centuries. It was introduced to China between 1940 and 1945, first to Fujian province, and subsequently to Taiwan, Guangdong, and Yunnan.

The herb's Chinese name literally means "rose eggplant," referring to the way its dried calyx shrivels to resemble a wilted rose. It is more widely known in Chinese popular culture as Luo Shen Hua (洛神花, "Goddess of the Luo River flower"), a romantic name connected to the legendary beauty Consort Mi (宓妃) from Chinese mythology. In the Arabic-speaking world, it is known as "karkade" and its tea is called "Sudan tea." In Latin America it goes by "flor de Jamaica" and is a beloved ingredient in agua de Jamaica.

Because of its late arrival in China, it first appeared in pharmacological literature in the Lingnan Nongkan (岭南农刊) rather than any classical materia medica. Its TCM properties were formally codified in the 2006 edition of the Fujian Provincial Chinese Medicinal Materials Standard. In contemporary use it has become one of the most popular herbal teas worldwide, prized for both its vivid ruby colour and its tart, cranberry-like flavour.

Modern Research

4 published studies investigating the pharmacological effects or clinical outcomes of Mei Gui Qie

1

Systematic review and meta-analysis: effects of Hibiscus sabdariffa on blood pressure and cardiometabolic markers (2022)

Ellis LR, Zulfiqar S, Holmes M, Marshall L, Dye L, Boesch C. Nutrition Reviews, 2022, 80(6):1723-1737.

This meta-analysis of 17 randomized controlled trials found that hibiscus consumption reduced systolic blood pressure by approximately 7.1 mmHg compared to placebo, and also lowered LDL cholesterol. The blood pressure reductions were comparable to those seen with standard antihypertensive medications, suggesting roselle may help reduce cardiovascular disease risk.

DOI
2

Meta-analysis: efficacy of Hibiscus sabdariffa in patients with mild-to-moderate hypertension (2022)

Abdelmonem M, Ebada MA, Diab S, et al. Journal of Cardiovascular Pharmacology, 2022, 79(1):e64-e74.

This meta-analysis of RCTs assessed hibiscus specifically in patients with mild-to-moderate hypertension. It found significant reductions in both systolic and diastolic blood pressure compared to placebo, though hibiscus was not superior to conventional antihypertensive drugs. The authors noted the need for more long-term studies.

DOI
3

Systematic review and meta-analysis: sour tea on cardiovascular disease risk factors (2020)

Boushehri SN, Karimbeiki R, Ghasempour S, et al. Phytotherapy Research, 2020, 34:329-339.

Pooling data from 7 RCTs with 362 participants, this meta-analysis found that hibiscus tea significantly reduced fasting blood glucose, systolic blood pressure, and diastolic blood pressure. The authors concluded hibiscus tea may have beneficial effects on glycaemic control and blood pressure in adult populations.

DOI
4

Meta-analysis: effect of sour tea on arterial hypertension (2015)

Serban C, Sahebkar A, Ursoniu S, Andrica F, Banach M. Journal of Hypertension, 2015, 33(6):1119-1127.

An earlier meta-analysis of available RCTs showed that Hibiscus sabdariffa supplementation had a significant effect on lowering both systolic and diastolic blood pressure, supporting its traditional use for managing hypertension.

DOI

Research on individual TCM herbs is growing but still limited by Western clinical trial standards. These studies provide emerging evidence and should be considered alongside practitioner expertise.