What patterns does Cheng Liu address?

Cheng Liu addresses these TCM patterns of disharmony: Wind-Heat invading the Lungs, Wind-Damp.

What conditions is Cheng Liu used for?

Cheng Liu is commonly used for: Skin Rashes, Itchy Skin, Common Cold, Hypochondrial Pain That Is Worse On Coughing And Breathing, Moving Pain, Chronic Bronchitis. A TCM practitioner would consider this herb when these conditions arise from the specific patterns it addresses.

Herb Twig (枝 zhī)

Cheng Liu

Q: What are the TCM actions of Cheng Liu?

The TCM actions of Cheng Liu include: Releases the Exterior and Vents Rashes, Dispels Wind-Dampness, Promotes Urination, Resolves Toxicity.

Tamarisk twig · 柽柳

Tamarix chinensis Lour. · Cacumen Tamaricis

Also known as: Xi He Liu (西河柳), San Chun Liu (三春柳), Guan Yin Liu (观音柳)

Images shown are for educational purposes only

Chinese tamarisk twig is best known in traditional Chinese medicine for helping skin rashes break out properly, especially measles in children that fail to erupt fully. It also gently disperses Wind and Dampness, making it useful for joint aches and common colds. The herb is mild in nature and primarily works by opening the body's surface to vent trapped pathogens outward.

Category Exterior-releasing herbs (解表药) Cool, acrid herbs that release the Exterior (辛凉解表药)

Therapeutic focus Skin Health Children's Health Joint and Muscle Health Immune Support

TCM Properties

Temperature

Neutral

Taste

Acrid / Pungent (辛 xīn), Sweet (甘 gān), Salty (咸 xián)

Channels entered

Lungs, Stomach, Heart

Parts used

Twig (枝 zhī)

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 Cheng Liu does in the body, explained in both everyday and TCM terms

Therapeutic focus

In practical terms, Cheng Liu is primarily used to support these areas of health:

Skin Health Children's Health Joint and Muscle Health Immune Support

TCM Actions

In TCM terminology, these are the specific therapeutic actions that Cheng Liu performs to restore balance in the body:

Releases the Exterior and Vents Rashes Dispels Wind-Dampness Promotes Urination Resolves Toxicity

How these actions work

'Releases the exterior and vents rashes' (发表透疹) is the primary and most celebrated action of this herb. In TCM, certain infectious febrile diseases, especially measles in children, involve toxins that need to be pushed outward through the skin as a rash. When the rash fails to emerge properly, toxins become trapped inside the body, causing restlessness, laboured breathing, and worsening fever. Chēng Liǔ's light, pungent, and dispersing nature helps guide these toxins outward through the skin, encouraging the rash to fully erupt. This is considered essential for recovery. The herb can be taken internally as a decoction or used externally as a wash.

'Dispels Wind and eliminates Dampness' (祛风除湿) means the herb helps clear pathogenic Wind and Dampness from the body's channels and joints. In practice, this makes it useful for joint pain and stiffness caused by Wind-Damp conditions, including what Western medicine calls rheumatic joint pain. For this purpose it is typically combined with stronger Wind-Dampness herbs like Qiāng Huó and Dú Huó.

'Promotes urination' and 'resolves toxins' are secondary actions. The Ben Cao Gang Mu notes it can resolve abdominal masses and counteract alcohol toxicity. Its diuretic effect helps expel pathogenic Heat and Dampness through the urine. Modern research has also shown antibacterial activity against several respiratory pathogens and a mild fever-reducing effect.

Patterns Addressed

In TCM, symptoms cluster into recognizable patterns of disharmony. Cheng Liu is used to help correct these specific patterns.

Why Cheng Liu addresses this pattern

When external Wind-Heat invades the Lung and blocks the skin's ability to vent, rashes (particularly measles) cannot erupt properly. The Lungs govern the skin and body surface, and when their dispersing function is impaired by pathogenic Wind-Heat, toxins become trapped. Chēng Liǔ enters the Lung channel and, with its pungent and dispersing nature, restores the Lung's ability to push pathogens outward through the skin. Its neutral-to-slightly-cool temperature means it does not aggravate the existing Heat, making it well-suited for this Heat-dominant pattern.

A practitioner would look for one or more of these signs

Skin Rashes

Measles or skin rashes that fail to erupt fully

Fever

Fever with restlessness and agitation

Hypochondrial Pain That Is Worse On Coughing And Breathing

Cough and laboured breathing

Sore Throat

Sore, swollen throat

Why Cheng Liu addresses this pattern

When Wind and Dampness invade the body's channels and settle in the joints, they cause pain, swelling, and stiffness. Chēng Liǔ's pungent taste disperses Wind from the channels, while its ability to promote urination helps drain Dampness. It enters the Stomach channel (which governs the flesh and muscles), giving it access to the musculoskeletal system where Bi syndrome manifests. While not the strongest Wind-Dampness herb, Chēng Liǔ contributes a gentle, surface-opening action that complements stronger expelling herbs.

A practitioner would look for one or more of these signs

Moving Pain

Wandering joint pain aggravated by wind or weather changes

Muscle Pain

Muscle aches with heaviness

Itchy Skin

Wind-type skin itching

Commonly Used For

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

Arises from: Wind-Heat invading the Lungs

TCM Interpretation

In TCM, measles and similar eruptive skin rashes are understood as the body's attempt to push internal Heat toxins outward through the skin. The Lungs govern the skin and body surface, while the Stomach governs the flesh and muscles where rashes manifest. When Wind-Heat pathogens block the Lung's dispersing function, the rash cannot emerge, trapping toxins inside. This causes escalating symptoms: fever, agitation, restlessness, cough, and laboured breathing. The key treatment principle is to vent the rash outward (透疹 tòu zhěn), clearing the way for the body to expel the toxins naturally.

Why Cheng Liu Helps

Chēng Liǔ directly enters the Lung, Stomach, and Heart channels, the three organs most involved in this condition. Its pungent taste opens the body's surface and its light, ascending nature carries toxins outward through the skin. Classical commentators describe it as having a unique ability to 'reach the surface and vent rash toxins.' It is mild enough for use in children and can be used both internally (as a decoction) and externally (as a warm wash to encourage eruption). It does not add excessive Heat, which would worsen the condition.

Also commonly used for

Itchy Skin

Wind-type rashes and itching; used as external wash or combined with Wind-dispelling herbs

Common Cold

Wind-Heat type common cold with fever and sore throat

Hypochondrial Pain That Is Worse On Coughing And Breathing

Cough and wheezing associated with external pathogen invasion

Chronic Bronchitis

Clinical studies have used tamarisk preparations for chronic bronchitis with cough, phlegm, and wheezing

Herb Properties

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

Temperature

Neutral

Taste

Acrid / Pungent (辛 xīn), Sweet (甘 gān), Salty (咸 xián)

Channels Entered

Lungs Stomach Heart

Parts Used

Twig (枝 zhī)

Dosage & Preparation

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

Standard dosage

3-10g

Maximum dosage

Up to 30g of fresh herb (or 15g dried) may be used in acute cases, particularly for external wash preparations. For internal decoction, classical physicians advised limiting the dose, with Zhang Shouyi cautioning that the penetrating action is very rapid and decoction doses should not exceed about 6g (二钱).

Dosage notes

For internal use as a measles-venting agent, standard decoction doses of 3-10g are appropriate. When used externally to wash or steam the skin for rash eruption or wind-rash itching, much larger quantities (60-90g) can be decocted in water for bathing. Fresh herb is generally preferred and used at roughly double the dried dose. For chronic bronchitis treatment (a modern clinical application), various preparations have been used including decoctions, granules, pills, and even injections, with the decoction form using approximately 30g of fresh herb (or 15g dried) combined with a small amount of alum. Use lower doses in weak or deficient patients, and avoid high doses that may cause nausea, dizziness, or irritability.

Preparation

No special decoction handling is required. The tender twigs and leaves are simply decocted normally. For external use, a larger quantity is decocted in water and used as a warm wash or steam bath for the skin. When used externally for measles, the classical method involves dipping cilantro (芫荽) in the warm decoction and gently rubbing the body (avoiding the head and face).

Common Herb Pairs

These ingredients are traditionally combined with Cheng Liu for enhanced therapeutic effect

Niu Bang Zi Chēng Liǔ 15g : Niú Bàng Zǐ 4.5g (as in Zhú Yè Liǔ Bàng Tāng)

Niú Bàng Zǐ (Arctium) clears Heat and resolves toxins from the Lung and throat while also venting rashes, and Chēng Liǔ adds its strong surface-opening, rash-venting action. Together they powerfully push trapped rash toxins outward through the skin while simultaneously clearing the Heat that drives the rash inward.

When to use: Measles or eruptive rashes that fail to emerge, with accompanying sore throat, cough, and fever.

Hu Sui Equal use; Chēng Liǔ decoction taken internally, Hú Suī used externally

Hú Suī (coriander/cilantro) is a classic folk remedy for promoting rash eruption. Combined with Chēng Liǔ, the two herbs reinforce each other's surface-venting action. Chēng Liǔ disperses from inside the body while Hú Suī is often used as an external rub to encourage eruption from outside.

When to use: Measles toxin trapped internally with rash failing to come out, especially in children. The decoction is taken internally while cilantro-soaked cloths are used to rub the body (except the face).

Jing Jie 1:1

Jīng Jiè (Schizonepeta) is a classic Wind-dispersing herb that releases the exterior and vents rashes. Paired with Chēng Liǔ, the two strongly open the body's surface, dispel Wind, and promote the outward movement of trapped pathogens. Jīng Jiè adds stronger Wind-expelling power while Chēng Liǔ contributes its specific rash-venting ability.

When to use: Wind-Cold or Wind-Heat type common cold, or rashes that fail to erupt due to exterior Wind constraint.

Qin Jiao 1:1

Qín Jiāo (Gentiana macrophylla root) is a strong Wind-Dampness expelling herb that relaxes sinews. Combined with Chēng Liǔ, the pair addresses Wind-Dampness in the channels and joints more comprehensively. Chēng Liǔ opens the surface while Qín Jiāo works deeper into the channels.

When to use: Wind-Dampness type joint pain with muscle tension and difficulty moving, especially when joints are stiff and aching.

Comparable Ingredients

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

Cheng Liu vs Jing Jie

Both disperse Wind, release the exterior, and vent rashes. However, Jīng Jiè is a broader exterior-releasing herb effective for many kinds of Wind conditions (both Wind-Cold and Wind-Heat), and its charred form (Jīng Jiè Tàn) can stop bleeding. Chēng Liǔ is more specialized: its strongest action is specifically venting rashes (透疹), making it the go-to herb when measles or similar eruptive diseases fail to erupt. Chēng Liǔ also has a Wind-Dampness expelling action for joint pain that Jīng Jiè does not prominently share.

Cheng Liu vs Chan Tui

Both vent rashes and disperse Wind. Chán Tuì (cicada moulting) also clears the eyes, benefits the throat, and stops spasms, giving it broader applications in eye diseases, voice loss, and childhood convulsions. Chēng Liǔ's rash-venting action is considered stronger and more direct, and it additionally addresses Wind-Dampness joint pain. In practice, both are often combined together in rash-venting formulas rather than used as substitutes.

Cheng Liu vs Sheng Ma

Both can promote the eruption of rashes. However, Shēng Má (Cimicifuga) is a cool, bitter herb that clears Heat and raises Yáng Qi, with much broader applications including treating gum inflammation, headaches from Yáng Ming channel Heat, and uterine/organ prolapse. Chēng Liǔ is gentler, more specifically focused on surface venting of rashes, and lacks Shēng Má's Yáng-raising properties. For incomplete rash eruption, they are often used together.

Common Substitutes & Adulterants

Related species and common adulterations to be aware of when sourcing Cheng Liu

Cheng Liu can come from three closely related Tamarix species: Tamarix chinensis Lour. (柽柳), Tamarix juniperina Bunge (桧柽柳, also called 华北柽柳), and Tamarix ramosissima Ledeb. (多枝柽柳). These are all considered acceptable source plants. The authentic herb should not be confused with true willow (Salix spp.) species, despite the many aliases containing 'willow' (柳). True willows have distinctly different leaf morphology (long, narrow, non-scaly leaves) and different pharmacological properties. When purchasing, verify the characteristic tiny scale-like leaves appressed to the stem, which distinguish Tamarix from Salix at a glance.

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

Toxicity Classification

Classical Chinese pharmacopoeia toxicity rating for Cheng Liu

Non-toxic

Classical sources such as the Lu Chan Yan Ben Cao (《履巉岩本草》) explicitly state that Cheng Liu is non-toxic (无毒). However, pharmacological research has shown that internal overdose can depress the midbrain and medulla oblongata, potentially causing a drop in blood pressure, respiratory difficulty, and in extreme cases, nervous system collapse. The classical physician Zhang Shouyi specifically warned that in decoction the dose should not exceed about 6g due to its extremely rapid penetrating and dispersing action. Minor side effects at high doses reported in clinical trials for chronic bronchitis include dry mouth, dizziness, upper abdominal discomfort, nausea, vomiting, and increased bowel movements, though these generally did not require discontinuation of treatment.

Contraindications

Situations where Cheng Liu should not be used or requires extra caution

Avoid

Measles rash that has already fully emerged (麻疹已透). Since the herb's primary action is to vent and bring rashes to the surface, using it after the rash has fully appeared can over-disperse and further deplete the body.

Avoid

Constitutionally weak patients with spontaneous or excessive sweating (体虚汗多). The herb's dispersing and exterior-releasing nature can worsen Qi deficiency and fluid loss in those who already sweat too easily.

Caution

Excessive dosage in decoction. Zhang Shouyi warned that the herb's penetrating and dispersing action is extremely rapid, and internal doses in decoction should not exceed about 6g (二钱). Overdose may cause irritability, nausea, vomiting, and drops in blood pressure.

Caution

Using as an external steam wash during cold weather or for patients already exposed to wind-cold. Classical physicians cautioned that undressing patients for hot herbal baths in spring or winter could expose them to further pathogenic cold, worsening the condition.

Special Populations

Important considerations for pregnancy, breastfeeding, and pediatric use

Pregnancy

No specific pregnancy contraindication is recorded in classical or modern texts for Cheng Liu. However, as an exterior-releasing herb with dispersing properties, it should be used with caution during pregnancy. Its ability to promote sweating and its pharmacological effect of dilating peripheral blood vessels and potentially lowering blood pressure suggest it should only be used when clearly indicated and under practitioner supervision. Pregnant women should avoid unnecessary use.

Breastfeeding

No specific warnings for breastfeeding mothers are recorded in classical sources. In fact, one traditional method for treating incomplete measles eruption in infants involved both the nursing mother and child taking Cheng Liu decoction internally. Nonetheless, as a dispersing exterior-releasing herb, it should only be used during breastfeeding when there is a clear clinical indication and under practitioner guidance. Avoid prolonged or high-dose use.

Children

Cheng Liu has been historically used specifically in pediatric medicine for incomplete eruption of measles rash, and it is generally considered suitable for children when properly indicated. Dosages should be reduced proportionally based on the child's age and weight, typically one-third to one-half of the adult dose. It can also be used externally as a warm decoction for bathing or gentle skin washing in children with rash that fails to emerge, though care must be taken to avoid chilling the child. Classical sources record that both the nursing mother and infant may take the decoction when treating measles in very young children.

Drug Interactions

If you are taking pharmaceutical medications, be aware of these potential interactions with Cheng Liu

No well-documented pharmaceutical drug interactions have been established for Cheng Liu in modern clinical literature. However, given the pharmacological finding that the herb can dilate blood vessels and lower blood pressure at higher doses, caution is theoretically warranted when combining it with antihypertensive medications, as additive hypotensive effects could occur.

Its mild diuretic action (noted by Li Shizhen as "利小便") suggests theoretical caution with concurrent diuretic drugs, which could potentiate fluid and electrolyte loss.

Dietary Advice

Foods and dietary considerations when taking Cheng Liu

When using Cheng Liu to help vent rashes or release exterior pathogens, avoid cold, raw, and greasy foods that could obstruct the exterior-releasing process. Light, easily digestible warm foods are preferred. Classical sources note that this herb can resolve alcohol toxicity, but alcohol should still be avoided during illness. During measles treatment, it is traditionally advised to avoid wind exposure and chilling foods.

Botanical Description

Physical characteristics and morphology of the Cheng Liu source plant

Cheng Liu (Tamarix chinensis Lour.) is a deciduous shrub or small tree of the Tamaricaceae family, typically growing 3 to 6 meters tall. It has slender, drooping reddish-brown branches with tiny scale-like or lance-shaped leaves arranged alternately and closely appressed to the stem, giving the foliage a feathery, almost conifer-like appearance. The leaves are grey-green, sometimes with a waxy bloom.

The plant flowers up to three times per year, producing dense, slender racemes (3 to 8 cm long) of tiny pale pink to rose-coloured flowers that collectively form terminal panicle-like clusters. The small capsule fruits split into three valves when ripe, releasing fine, cottony seeds. The bark is dark reddish-brown and somewhat fissured on older trunks.

Cheng Liu is remarkably tolerant of drought, salt, and alkaline soils. It commonly grows on riverbanks, coastal flats, sandy ground, and saline-alkaline wasteland. It is widely distributed across China and is valued both for land reclamation (sand fixation and windbreak) and as an ornamental for its graceful, pendulous habit and repeated pink flowering.

Sourcing & Harvesting

Where Cheng Liu is sourced, when it's harvested or collected, and how to assess quality

Harvesting season

Tender branches and leaves are collected in late spring to early summer (April to June), before the flowers have opened, then dried in the shade.

Primary growing regions

Widely distributed across China, with no single dominant terroir region. Major producing areas include the Yellow River basin (Shandong, Hebei, Henan, Shanxi), the Yangtze River basin (Jiangsu, Anhui, Hubei), and also Liaoning, Fujian, Guangdong, Guangxi, Yunnan, and Xinjiang. Xinjiang and other northwest regions produce the closely related Tamarix ramosissima (多枝柽柳, commonly called 'hong liu' or red willow). The Shandong coastal region, notably the Changyi National Marine Ecological Reserve, is known for extensive wild tamarisk forests. The plant thrives naturally on riverbanks, sandy plains, coastal flats, and saline-alkaline soils throughout much of China.

Quality indicators

Good quality Cheng Liu consists of fine, tender twig tips with leaves still attached. The best material is grey-green to yellow-green in colour, with intact small scale-like leaves. The twigs should be slender (under 1.5mm diameter), brittle, and easy to snap. The aroma is faint and the taste is bland. Avoid material with thick, older woody stems (over 3mm diameter) that have turned reddish-brown and lost their leaves. Also avoid material with excessive debris, discolouration, or mould. As the classical quality standard states: colour should be green, texture should be tender, and free of impurities (以色绿、质嫩、无杂质者为佳).

Classical Texts

Key passages from the classical Chinese medical texts that describe Cheng Liu and its therapeutic uses

Ben Cao Gang Mu (《本草纲目》, Li Shizhen, Ming Dynasty)

Chinese: 消痞，解酒毒，利小便。

English: Disperses abdominal masses, resolves alcohol toxicity, and promotes urination.

Ben Cao Bei Yao (《本草备要》)

Chinese: 治痧疹不出，喘嗽闷乱。

English: Treats measles rash that fails to emerge, with wheezing, coughing, chest oppression and restlessness.

Ben Jing Feng Yuan (《本经逢原》)

Chinese: 去风；煎汤浴风疹身痒效。

English: Dispels wind; bathing in its decoction is effective for wind-rash with itchy skin.

Ben Cao Hui Yan (《本草汇言》)

Chinese: 柽柳，凉血分，发痧瘩，解痧毒之药也。此药轻清升散，开发瘄毒。与桔梗、甘草、牛蒡子同用更善。

English: Cheng Liu cools the Blood level, vents measles rash, and resolves measles toxin. It is light, clear, ascending, and dispersing in nature, capable of opening and releasing measles toxin outward. It works even better when combined with Jie Geng, Gan Cao, and Niu Bang Zi.

De Pei Ben Cao (《得配本草》)

Chinese: 解瘟疫之躁乱，开肌肉之邪结，一切风火疠气，非此不能达表。

English: Resolves the agitation and turmoil of epidemic disease, opens the knotted pathogenic factors in the flesh and muscles. For all wind, fire, and pestilential Qi, nothing but this herb can bring them out to the exterior.

Historical Context

The history and evolution of Cheng Liu's use in Chinese medicine over the centuries

Cheng Liu has one of the longest documented histories of any Chinese plant, with its earliest mention appearing in the Shi Jing (Book of Songs, ca. 11th–7th century BCE). The Da Ya section contains the line "启之辟之，其柽其椐" (clearing the land of its tamarisks and thorny trees). The character 柽 was explained by classical commentators as deriving from 圣 (shèng, 'sage' or 'holy'), because the tree was believed to sense approaching rain and respond by producing flower buds, making it "the sage among trees" (木之圣者也). This rain-predicting quality earned it the folk name 'Rain Master' (雨师).

Its medicinal use was first recorded in the Kai Bao Ben Cao (Song Dynasty, 10th century), under the name 'Three-Spring Willow' (三春柳), referring to its habit of flowering three times a year. Li Shizhen's Ben Cao Gang Mu (Ming Dynasty) documented its use for abdominal masses, alcohol toxicity, and promoting urination. However, its most celebrated clinical application, treating incomplete eruption of measles rash in children, was primarily developed by Ming and Qing dynasty physicians. The Ben Cao Hui Yan (Qing Dynasty) and Ben Cao Jing Shu gave detailed discussions of its role in venting measles toxin, and it became a key ingredient in formulas such as Zhu Ye Liu Bang Tang (竹叶柳蒡汤). Another popular name, 'Guanyin Willow' (观音柳, Avalokiteshvara's Willow), reflects folk reverence for its healing properties. It also bears the name 'Three-Sleep Willow' (三眠柳), a poetic reference to its branches drooping and rising three times, as if sleeping and waking.

Modern Research

3 published studies investigating the pharmacological effects or clinical outcomes of Cheng Liu

Hepatoprotective effects of Tamarix chinensis Lour against chronic ethanol-induced liver injury in mice (Preclinical, 2020)

Ma XY, Zhang M, Fang G, Cheng CJ, Wang MK, Han YM, Yang XY, Hou X, Guo TK. World Journal of Gastroenterology, 2020, 26(12): 1286-1302.

This mouse study found that Tamarix chinensis extract (100 and 200 mg/kg) significantly protected against alcohol-induced liver damage. It reduced liver enzymes (ALT, AST), decreased oxidative stress markers, and suppressed the NLRP3 inflammasome pathway involved in liver inflammation. The results support its traditional use for resolving alcohol toxicity.

PubMed

Flavonoid-substituted polysaccharides from Tamarix chinensis alleviate H1N1-induced acute lung injury via inhibiting complement system (Preclinical, 2024)

Jiao Y, Zhou L, Huo J, Li H, Zhu H, Chen D, Lu Y. Journal of Ethnopharmacology, 2024, 322: 117651.

Researchers isolated novel polysaccharides with flavonoid substituents from Tamarix chinensis and demonstrated they could ameliorate influenza A virus-induced acute lung injury in experimental models by inhibiting excessive complement system activation and reducing inflammation. These findings provide a modern pharmacological basis for the herb's traditional respiratory applications.

PubMed

Phytochemical and pharmacological properties of the genus Tamarix: a comprehensive review (Review, 2024)

Li F, Xie W, Ding X, Xu K, Fu X. Archives of Pharmacal Research, 2024, 47(5): 410-441.

This comprehensive review catalogued 655 naturally occurring compounds from the Tamarix genus, including flavonoids, phenols, tannins, terpenoids, and essential oils. The review summarized evidence for antibacterial, anti-inflammatory, antioxidant, hepatoprotective, anticancer, and antidiabetic activities across multiple Tamarix species including T. chinensis.

PubMed

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.