What patterns does Qing Hao address?

Qing Hao addresses these TCM patterns of disharmony: Yin Deficiency, Residual Pathogenic Heat lurking in the Yin Level, Summer-Heat, Damp-Heat.

What conditions is Qing Hao used for?

Qing Hao is commonly used for: Malaria, Low Grade Fever, Night Sweats, Jaundice, Tuberculosis, Fever, Urinary Tract Infection, Hepatitis, Hot Flushes, Skin Itching And Rashes. A TCM practitioner would consider this herb when these conditions arise from the specific patterns it addresses.

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Herb Whole plant / Aerial parts (全草 quán cǎo)

Qing Hao

Q: What are the TCM actions of Qing Hao?

The TCM actions of Qing Hao include: Clears Deficiency Heat, Cools the Blood and eliminates steaming bone disorder, Clears Summer-Heat, Checks Malaria, Clears Liver and Gallbladder Heat, Clears Damp-Heat and Resolves Jaundice.

Sweet wormwood · 青蒿

Artemisia annua L. · Artemisiae Annuae Herba

Also known as: Sweet Annie, Annual wormwood, Huang Hua Hao (黄花蒿), Cao Hao (草蒿), Chou Hao (臭蒿), Xiang Qing Hao (香青蒿), Ku Hao (苦蒿), Qinghaosu plant

Images shown are for educational purposes only

Sweet wormwood is a cold, bitter herb best known for clearing lingering, low-grade fevers and the sensation of deep internal heat, especially the kind that worsens at night. It is also the plant from which the Nobel Prize-winning antimalarial compound artemisinin was discovered. In TCM, it is most commonly used for people recovering from prolonged illness who still have residual heat, as well as for summer-heat illness and malarial fevers.

Category Herbs that clear Deficiency Heat (清虚热药)

Therapeutic focus Fever Management Immune Support Liver and Gallbladder Health Hot Flashes and Night Sweats

TCM Properties

Temperature

Cold

Taste

Bitter (苦 kǔ), Acrid / Pungent (辛 xīn)

Channels entered

Liver, Gallbladder, Kidneys

Parts used

Whole plant / Aerial parts (全草 quán cǎo)

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What This Herb Does

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

Therapeutic focus

In practical terms, Qing Hao is primarily used to support these areas of health:

Fever Management Immune Support Liver and Gallbladder Health Hot Flashes and Night Sweats

TCM Actions

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

Clears Deficiency Heat Cools the Blood and eliminates steaming bone disorder Clears Summer-Heat Checks Malaria Clears Liver and Gallbladder Heat Clears Damp-Heat and Resolves Jaundice

How these actions work

'Clears deficiency heat' means Qīng Hāo can address low-grade, lingering fevers that come from a depletion of the body's Yin (its cooling, moistening aspect). This is the herb's signature strength. Unlike herbs that fight acute, raging fevers, Qīng Hāo specializes in the smoldering, difficult-to-clear heat that persists after a severe illness or in people with chronic Yin Deficiency. It is particularly suited for the classic pattern of 'night fever with early morning coolness,' where heat flares at night and subsides by dawn without any sweating.

'Cools the Blood and eliminates steaming bone disorder' refers to its ability to clear deep-seated heat lodged in the Yin level and blood. 'Steaming bone' (骨蒸 gǔ zhēng) is a TCM term for a sensation of heat radiating outward from deep within the bones, often accompanied by afternoon or evening fevers, night sweats, flushed cheeks, and progressive weight loss. Because Qīng Hāo enters the Liver channel and reaches the blood level, it can access and clear this deeply lodged heat in a way that many surface-level heat-clearing herbs cannot.

'Resolves summer-heat' means this herb is effective for illnesses caused by exposure to summer heat and humidity, with symptoms like fever, headache, thirst, and a heavy, oppressed feeling. Its aromatic quality allows it to disperse and vent summer-heat outward without drying out body fluids, making it gentler than many other cold-natured herbs.

'Intercepts malaria' (截疟 jié nüè) means Qīng Hāo can directly halt malarial episodes with their characteristic alternating chills and fever. This has been its most globally celebrated action since the discovery of artemisinin. In TCM practice, it is used either alone in large fresh doses or combined with other herbs to treat malarial patterns.

'Clears Liver and Gallbladder heat' reflects the herb's primary channel affinity. It can address heat lodged in the Liver and Gallbladder, which may manifest as bitter taste in the mouth, rib-side discomfort, irritability, or red eyes. This action also underlies its use in Damp-Heat jaundice, where Liver and Gallbladder heat combines with Dampness to produce yellowing of the skin.

Patterns Addressed

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

Why Qing Hao addresses this pattern

Qīng Hāo is bitter, pungent, and cold, entering the Liver and Kidney channels. In Yin Deficiency with Empty Heat, the body's cooling Yin fluids are depleted, allowing internal heat to flare unopposed. Qīng Hāo's cold nature directly clears this deficiency heat, while its pungent, aromatic quality gives it the unique ability to vent hidden heat from the Yin level outward to the surface. This 'clearing from within and venting outward' action distinguishes it from purely cold, descending herbs, making it ideal for heat that is trapped deep in the blood and Yin levels. Classical commentary describes it as able to 'lead heat from within the bones to the muscle surface.'

A practitioner would look for one or more of these signs

Night Sweats

Especially with afternoon or evening heat

Low Grade Fever

Night fever that resolves by early morning without sweating

Hot Flushes

Steaming bone sensation, flushed cheeks

Dry Mouth

Thirst from Yin fluid depletion

Why Qing Hao addresses this pattern

In the late stage of a warm-febrile disease (温病 wēn bìng), pathogenic heat may fail to fully clear and instead burrows into the Yin level, producing the classic pattern of 'night fever with early morning coolness, heat receding without sweating.' This occurs because defensive Qi enters the interior at night, where it meets the lingering pathogenic heat and drives up temperature. By morning, defensive Qi returns to the surface, and temperature drops, but the damaged Yin cannot produce enough sweat to expel the pathogen. Qīng Hāo's aromatic, pungent quality penetrates the Yin level and draws out this hidden heat, while its bitter coldness clears the heat directly. As Wu Tang noted in the Wen Bing Tiao Bian, Qīng Hāo 'cannot enter the Yin level alone' but paired with Yin-nourishing substances like turtle shell, it can reach deep and then lead the pathogen out.

A practitioner would look for one or more of these signs

Low Grade Fever

Fever worse at night, cool in the morning

Night Sweats

Or absence of sweating as fever recedes

Dry Mouth

Red tongue with little coating, signs of Yin damage

Why Qing Hao addresses this pattern

When Damp-Heat lodges in the Shaoyang (Gallbladder/Triple Burner), it produces alternating chills and fever (with heat predominating), bitter taste, chest oppression, nausea, and vomiting of bitter or sour fluid. Qīng Hāo enters the Liver and Gallbladder channels and excels at clearing heat from the Shaoyang level while its aromatic nature resolves dampness and turbidity. Classical physicians noted that it 'clears and vents Shaoyang heat' in a manner softer than Chai Hu, and without Chai Hu's tendency to injure Yin, making it better suited when heat and dampness coexist.

A practitioner would look for one or more of these signs

Alternating Sensation Of Hot And Cold

Chills and fever with heat predominating

Bitter Taste In The Mouth

Bitter taste in the mouth from Gallbladder heat

Nausea Or Vomiting

Vomiting bitter or sour fluid

Commonly Used For

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

Arises from: Yin Deficiency Residual Pathogenic Heat lurking in the Yin Level

TCM Interpretation

In TCM, persistent low-grade fever can arise from two main mechanisms. First, after a prolonged or severe illness, the body's Yin fluids become depleted and can no longer keep internal heat in check, resulting in what is called 'empty heat' or 'deficiency heat.' This produces fevers that tend to be worse in the afternoon or evening, often accompanied by night sweats, flushed cheeks, and a sensation of heat in the palms and soles. Second, a pathogenic factor may linger in the deep Yin level after the acute phase of an illness has passed. The Liver, Kidneys, and blood level are the organ systems most involved, and the heat is considered to be lodged deep rather than at the surface.

Why Qing Hao Helps

Qīng Hāo directly addresses both mechanisms. Its cold, bitter nature clears deficiency heat and cools the blood, while its pungent, aromatic quality gives it the unusual ability to reach into the Yin level and draw out hidden heat to the surface where it can be resolved. This dual 'entering and exiting' action is precisely what is needed for fevers that are trapped deep within the body. Classical physician Wang Ang noted that Qīng Hāo and similar pungent-cold herbs 'remove Liver and Gallbladder heat and scatter it at the surface' while Yin-nourishing partners address the root deficiency.

Arises from: Damp-Heat

TCM Interpretation

TCM understands malaria as a condition where a pathogenic factor alternates between the body's interior and exterior, producing the characteristic cycle of chills followed by high fever and then sweating. This pattern is attributed to the Shaoyang level, the 'hinge' between the exterior and interior. The pathogenic factor is often described as a combination of heat and dampness or turbidity. The Liver and Gallbladder are the primary organ systems involved, and the pathogen disrupts the normal flow of Qi through these channels.

Why Qing Hao Helps

Qīng Hāo enters the Liver and Gallbladder channels and has a powerful 'intercepting' (截 jié) action on malarial fevers. Its aromatic nature disperses turbidity and dampness, while its cold nature clears the intense heat of malarial attacks. Historically, fresh Qīng Hāo juice was considered the most effective preparation, as the fourth-century physician Ge Hong recommended soaking the fresh herb in cold water and drinking the expressed juice. This method, which avoids heat that would destroy the active compounds, proved prescient when modern scientists discovered that artemisinin is poorly water-soluble and heat-sensitive.

Also commonly used for

Jaundice

Damp-Heat jaundice affecting Liver and Gallbladder

Tuberculosis

Afternoon fevers, night sweats, and wasting in consumptive disease

Fever

Summer-heat fever or post-illness residual fever

Urinary Tract Infection

Chronic pyelonephritis with low-grade fever and Yin Deficiency

Hepatitis

Acute jaundice-type hepatitis with Damp-Heat

Hot Flushes

Menopausal or Yin-deficiency related flushing and heat sensations

Skin Itching And Rashes

Wind-heat skin conditions, scabies, and dermatitis

Herb Properties

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

Temperature

Cold

Taste

Bitter (苦 kǔ), Acrid / Pungent (辛 xīn)

Channels Entered

Liver Gallbladder Kidneys

Parts Used

Whole plant / Aerial parts (全草 quán cǎo)

Dosage & Preparation

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

Standard dosage

6–12g

Maximum dosage

Up to 20g in decoction for acute febrile conditions, under practitioner supervision. For fresh herb juice (used traditionally for malaria), up to 200g of fresh herb may be used to extract juice.

Dosage notes

Use lower doses (6–9g) for clearing deficiency Heat and night sweats. Use moderate to higher doses (9–15g) for summerheat patterns and malaria. For treating malaria in the traditional manner, fresh herb juice is considered superior to decoction, as Ge Hong's classical method specifies cold soaking and wringing rather than boiling. The effective antimalarial compound artemisinin is heat-sensitive, so when decocting, Qing Hao should be added near the end of cooking (hou xia / 后下) to preserve its volatile active components. Excessively prolonged boiling significantly reduces therapeutic potency.

Preparation

Add near the end of decoction (后下, hou xia). Qing Hao contains volatile aromatic compounds and the heat-sensitive active constituent artemisinin. Prolonged boiling destroys these components and greatly reduces efficacy. Add to the strained decoction in the final 5–10 minutes of cooking. For treating malaria, the classical method is cold infusion: soak fresh herb in water, wring out the juice, and drink without heating.

Processing Methods

In TCM, the same herb can be prepared in different ways to change its effects — here's how processing alters what Qing Hao does

Processing method

The cut herb segments are dry-fried over a gentle flame until they turn slightly yellow or brownish-yellow.

How it changes properties

Dry-frying moderates the herb's cold nature slightly and enhances its ability to clear deep-seated steaming bone heat. The aromatic dispersing quality is somewhat reduced, concentrating the herb's action on clearing deficiency heat from the interior.

When to use this form

Preferred for chronic steaming bone disorder (骨蒸劳热) and consumptive heat patterns where the raw herb's strong coldness may be too harsh for the weakened Spleen and Stomach.

Common Herb Pairs

These ingredients are traditionally combined with Qing Hao for enhanced therapeutic effect

Bie Jia Qīng Hāo 6g : Biē Jiǎ 15g (approximately 1:2.5)

This is the most famous herb pair involving Qīng Hāo. Turtle shell (Bie Jia) is salty and cold, directly enters the Yin level to nourish Yin and search out hidden pathogens within the deep channels. Qīng Hāo is aromatic and pungent, able to vent heat outward from the Yin level to the surface. Together they create a complementary 'enter and exit' dynamic: Bie Jia leads Qīng Hāo into the deep Yin level, while Qīng Hāo leads pathogens out from where Bie Jia has reached. This achieves what neither herb can do alone.

When to use: Warm-febrile disease in the late stage with night fever and early morning coolness, heat receding without sweating, or for Yin Deficiency with steaming bone heat, night sweats, and tidal fever.

Huang Qin 1:1 (Qīng Hāo 6g : Huáng Qín 6–9g)

Qīng Hāo clears and vents Shaoyang heat from the Liver and Gallbladder through its aromatic, dispersing quality, while Huang Qin (Scutellaria) clears and drains heat from the Gallbladder and Upper/Middle Burner through its bitter, descending quality. Together they clear Damp-Heat from the Shaoyang more effectively than either alone, combining outward venting with downward draining.

When to use: Gallbladder heat invading the Stomach with Damp turbidity, presenting as bitter taste, chest oppression, nausea, vomiting of bitter or sour fluid, or alternating chills and fever with heat predominating. Also for Damp-Heat jaundice and summer-dampness turning into malarial patterns.

Bai Wei 1:1 (Qīng Hāo 6–10g : Bái Wēi 6–10g)

Both herbs cool the blood and clear deficiency heat. Bai Wei (Cynanchum root) is bitter, salty, and cold, with a particular ability to benefit Yin and cool blood-level heat. Together they reinforce each other's capacity to clear Yin-deficiency heat and cool the blood, while Qīng Hāo adds the ability to vent hidden heat outward.

When to use: Yin Deficiency fever, blood-level heat with night sweats, or post-partum fever from blood deficiency with residual heat. Especially useful in pediatric consumption fever (疳热).

Di Gu Pi 1:1 (Qīng Hāo 6–10g : Dì Gǔ Pí 9–15g)

Di Gu Pi (Lycium root bark) is sweet and cold, excelling at cooling blood-level heat and clearing deficiency heat from the Lungs, Liver, and Kidneys. Combined with Qīng Hāo, the pair clears deficiency heat from multiple levels simultaneously. Qīng Hāo reaches into the bone level and vents heat outward, while Di Gu Pi cools blood heat and clears floating fire.

When to use: Steaming bone disorder, chronic low-grade fever, tidal fevers, and night sweats from Yin Deficiency. Often used together in formulas for tuberculosis and other consumptive conditions.

Key Formulas

These well-known formulas feature Qing Hao in a prominent role

Qing Hao Bie Jia Tang 青蒿鱉甲湯 King

The defining formula for Qīng Hāo's signature action. From the Wen Bing Tiao Bian, this formula exemplifies the herb's unique ability to penetrate the Yin level and vent hidden heat outward. Qīng Hāo serves as co-King with turtle shell (Bie Jia), showcasing the 'enter and exit' strategy. Wu Tang wrote that 'Qīng Hāo cannot enter the Yin level alone, turtle shell leads it in; turtle shell cannot exit the Yang level alone, Qīng Hāo leads it out.'

Hao Qin Qing Dan Tang 蒿芩清胆汤 King

From the Chong Ding Tong Su Shang Han Lun (Revised Popular Treatise on Cold Damage), this formula showcases Qīng Hāo's ability to clear Shaoyang Damp-Heat. As co-King with Huang Qin, Qīng Hāo clears and vents Gallbladder-level heat while resolving dampness and turbidity. The formula demonstrates its advantage over Chai Hu in Damp-Heat conditions where Yin must be preserved.

Qing Gu San 清骨散 Assistant

From the Zheng Zhi Zhun Sheng (Standards of Diagnosis and Treatment), this classic formula for steaming bone disorder uses Qīng Hāo as an Assistant alongside Yin Chai Hu (King), turtle shell, Di Gu Pi, Qin Jiao, and Hu Huang Lian. It illustrates Qīng Hāo's role in clearing Liver and Gallbladder heat and dispersing it outward while other herbs in the formula cool blood and nourish Yin from within.

Comparable Ingredients

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

Qing Hao vs Chai Hu

Both enter the Liver and Gallbladder channels and treat alternating chills and fever. However, Chai Hu is pungent and rising in nature, excelling at spreading Liver Qi stagnation and raising clear Yang. It is better suited for Shaoyang patterns in cold-damage conditions. Qīng Hāo is aromatic and descending-cool, better at clearing heat without injuring Yin. Overuse of Chai Hu tends to dry and deplete Yin, while Qīng Hāo is safer when Yin is already damaged. For malarial patterns with Damp-Heat or in patients with Yin Deficiency, Qīng Hāo is the better choice.

Qing Hao vs Yin Chai Hu

Both cool the blood and reduce steaming bone disorder. Despite similar names, they are completely different plants. Yin Chai Hu (Stellaria root) is sweet and cool, primarily clearing deficiency heat from the blood level without any dispersing or venting action. Qīng Hāo adds the ability to vent hidden heat outward from the Yin level and can also resolve summer-heat and intercept malaria. For pure deficiency heat without exterior involvement, Yin Chai Hu is gentler; when heat is trapped in the Yin level and needs to be drawn outward, Qīng Hāo is more appropriate.

Qing Hao vs Zhi Mu

Both are bitter and cold and can clear deficiency heat and steaming bone disorder. However, Zhi Mu (Anemarrhena) is sweet, moist, and enters the Lung, Stomach, and Kidney channels, making it better for clearing blazing Stomach fire, moistening Lung dryness, and treating dry cough or intestinal dryness with constipation. Qīng Hāo is pungent and aromatic, entering the Liver and Gallbladder, and excels at venting hidden heat from the Yin level outward and intercepting malaria. Zhi Mu treats the root (nourishes Yin and clears fire); Qīng Hāo treats both root and branch by clearing and venting simultaneously.

Common Substitutes & Adulterants

Related species and common adulterations to be aware of when sourcing Qing Hao

The most significant confusion is between the Pharmacopoeia-defined 'Qing Hao' source plant Artemisia annua (Huang Hua Hao / 黄花蒿) and the botanical species actually named Artemisia carvifolia (Qing Hao / 青蒿 in taxonomy). The latter does NOT contain artemisinin and has weaker therapeutic action. In northern China, Yin Chen Hao (Artemisia capillaris, used for jaundice) has historically been confused with Qing Hao, particularly because a folk saying suggests that young Yin Chen becomes Qing Hao when mature. Zhang Lu in the Qing dynasty Ben Jing Feng Yuan mistakenly described Qing Hao as having a purple stem, likely confusing it with Yin Chen Hao. Practitioners should ensure the herb has the characteristic strong pungent aroma, yellowish-green color, and finely divided leaf segments of authentic Artemisia annua.

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

Toxicity Classification

Classical Chinese pharmacopoeia toxicity rating for Qing Hao

Non-toxic

Qing Hao is classified as non-toxic in the Chinese Pharmacopoeia and has a long history of safe use. Classical texts including the Shen Nong Ben Cao Jing and Ben Cao Qiu Zhen describe it as having no toxicity (无毒). The main clinical concern is not poisoning but rather its strongly cold and bitter nature, which can injure the Spleen and Stomach if used excessively or in constitutionally cold patients. Purified artemisinin derivatives used pharmaceutically at high doses have been associated with rare cases of transient liver enzyme elevation, but this is not characteristic of the traditional herbal decoction at standard dosages.

Contraindications

Situations where Qing Hao should not be used or requires extra caution

Caution

Spleen and Stomach deficiency with cold and diarrhea. Qing Hao is bitter and cold in nature and can further damage an already weak digestive system. Classical texts including the Ben Cao Tong Xuan state that those with Stomach deficiency should not take this herb.

Caution

Postpartum Blood deficiency with internal cold causing diarrhea. The Ben Cao Jing Shu specifically warns against use in this condition, and advises that postpartum patients with weak Spleen and Stomach should not combine Qing Hao with Dang Gui or Di Huang.

Caution

Diarrhea due to food stagnation. The cold, bitter nature of Qing Hao may worsen digestive dysfunction when the root cause is food retention rather than Heat.

Caution

Absence of true Heat or Yin-deficiency patterns. Qing Hao clears deficiency-type Heat from the Yin level. Using it in patients without genuine Heat signs (especially those with Yang deficiency or internal Cold) is inappropriate and may cause harm.

Special Populations

Important considerations for pregnancy, breastfeeding, and pediatric use

Pregnancy

Use with caution during pregnancy. Qing Hao is bitter and cold, which can potentially disturb the fetus in susceptible individuals. While classical texts do not explicitly list it as a pregnancy-prohibited herb, the Ben Cao Jing Shu specifically warns against its use in postpartum Blood deficiency. Additionally, purified artemisinin derivatives have shown embryotoxicity in animal models at high doses. At standard TCM decoction dosages, occasional short-term use for clear Heat indications is considered lower risk, but prolonged use should be avoided. A qualified practitioner should always be consulted.

Breastfeeding

No specific classical contraindication exists for breastfeeding. However, the bitter and cold properties of Qing Hao could theoretically affect the quality of breast milk or cause digestive upset in the nursing infant. Artemisinin and its metabolites have not been well studied for transfer into breast milk. It is prudent to use only at standard doses for short periods when clearly indicated, and to monitor the infant for any signs of loose stools or feeding difficulties.

Children

Qing Hao can be used in children at reduced doses appropriate to age and body weight, typically one-third to one-half of the adult dose. It has a long history of use in pediatric febrile conditions, particularly for Yin-deficiency fever and tidal fever in children. The bitter taste may be difficult for young children to accept. Fresh juice preparations, which were historically used for malaria, should be used cautiously in very young children due to the concentrated nature of the preparation.

Drug Interactions

If you are taking pharmaceutical medications, be aware of these potential interactions with Qing Hao

CYP450 enzyme interactions: Research shows that artemisinin, the key active compound in Qing Hao, affects multiple cytochrome P450 enzymes. It initially inhibits CYP1A2 and then induces CYP3A4, CYP2B6, and CYP2C19 with repeated dosing. This means Qing Hao may alter the blood levels of drugs metabolized by these enzymes. Caution is warranted when combining with:

CYP3A4 substrates (e.g. cyclosporine, some statins, calcium channel blockers, HIV protease inhibitors): artemisinin's induction of CYP3A4 could reduce their effectiveness
CYP1A2 substrates (e.g. theophylline, clozapine, some antidepressants): initial inhibition could temporarily raise drug levels
Anticoagulants (e.g. warfarin, processed via CYP2C9/3A4): potential for altered anticoagulant effect
Antiretroviral medications: pharmacokinetic interactions with HIV drugs metabolized by CYP3A4 have been documented in clinical studies

Note: These interactions are best characterized for purified artemisinin derivatives at pharmaceutical doses. Traditional decoctions deliver considerably lower artemisinin concentrations, but the interaction potential should still be considered when patients are on narrow therapeutic index medications.

Dietary Advice

Foods and dietary considerations when taking Qing Hao

While taking Qing Hao for clearing deficiency Heat, avoid excessively greasy, rich, or hard-to-digest foods that burden the Spleen and Stomach, as the herb's cold nature already taxes digestion. Cold, raw foods should not be combined, particularly in patients with underlying Spleen weakness. Light, easily digestible meals are recommended. When using Qing Hao for summerheat conditions, adequate hydration and cooling foods such as mung bean soup are complementary.

Botanical Description

Physical characteristics and morphology of the Qing Hao source plant

Artemisia annua L. (Asteraceae family), known as sweet wormwood or annual wormwood, is a highly aromatic annual herb. It grows erect with a cylindrical stem that is brownish or violet-brown, branching profusely, typically reaching 50–150 cm in height but occasionally up to 200 cm under cultivation. The leaves are alternate, deeply dissected into three-times pinnately divided segments with narrow lobes, bright green on both surfaces, and dotted with tiny glandular trichomes that produce essential oils. The whole plant has a distinctive strong, somewhat pungent aroma.

In late summer and autumn, it produces numerous tiny spherical flower heads (about 2 mm across) arranged in drooping terminal panicles. The flowers are tubular, pale yellow, and pollinated by both wind and insects. The plant produces abundant small achene fruits. It grows readily in open, sunny, well-drained sites along roadsides, wastelands, hillsides, river banks, and forest margins. Native to temperate Asia, it has naturalized widely across Europe, North Africa, and the Americas, thriving at elevations from sea level up to 3,650 m on the Tibetan plateau.

Sourcing & Harvesting

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

Harvesting season

Autumn, when the flowers are in full bloom (typically August to October). For maximum artemisinin content, harvest at flower-bud stage before full flowering.

Primary growing regions

Qing Hao (Artemisia annua) is found throughout China, but the southern provinces produce herb with significantly higher artemisinin content than the north. The most famous production region with 'daodi' (terroir) status is Chongqing Municipality, particularly Youyang County, which enjoys the title 'Capital of Qing Hao' and produces herb with the highest artemisinin concentrations in the world (averaging above 0.8%, some cultivars reaching 1.6%). Guangxi Province (especially Rong'an County, the largest artemisinin extraction base globally), Sichuan, Guizhou, Yunnan, Hunan, and Hainan also produce high-quality herb. Qing Hao is also listed among the notable Sichuan daodi medicinals (川药).

Quality indicators

Good quality dried Qing Hao should have stems that are yellowish-green to brownish-yellow on the outside with visible longitudinal ridges. The leaves should be dark green or brownish-green (not blackened or moldy). When unrolled, leaves display the characteristic three-times pinnately divided pattern. The cross-section of the stem shows a central pith. Most importantly, the herb should have a strong, distinctive aromatic fragrance and a slightly bitter taste. Material that has lost its aroma, or that appears overly dry, brittle, and pale, is likely old or improperly stored. Avoid specimens with excessive stem material and few leaves, as the active constituents are concentrated in the leaves and flowering parts.

Classical Texts

Key passages from the classical Chinese medical texts that describe Qing Hao and its therapeutic uses

Shen Nong Ben Cao Jing (《神农本草经》)

「味苦，寒。主疥瘙痂痒，恶疮，杀虱，留热在骨节间，明目。」

"Bitter in taste, cold in nature. Treats scabies, itching sores, malignant ulcers, kills lice, clears lingering Heat in the joints, and brightens the eyes."

Zhou Hou Bei Ji Fang (《肘后备急方》) by Ge Hong, Jin Dynasty

「青蒿一握，以水二升渍，绞取汁，尽服之。」

"Take a handful of Qing Hao, soak in two sheng of water, wring out the juice, and drink it all." (For treating alternating chills and fever in malaria. This famous passage directly inspired Tu Youyou's low-temperature extraction method for artemisinin.)

Ben Cao Gang Mu (《本草纲目》) by Li Shizhen

「青蒿得春木少阳之气最早，故所主之证，皆少阳、厥阴血分之病也。」

"Qing Hao receives the Shaoyang Qi of spring wood the earliest; therefore, the conditions it governs all pertain to diseases of the Blood level of the Shaoyang and Jueyin channels."

Ben Cao Xin Bian (《本草新编》)

「专解骨蒸劳热，尤能泄暑热之火，愈风瘙痒，止虚烦盗汗，开胃，安心痛，明目辟邪，养脾气，此药最佳。」

"Especially effective for resolving steaming bone Heat and consumptive fever, particularly good at draining summerheat Fire, healing wind-type itching, stopping deficiency-irritability and night sweats, opening the appetite, calming heart pain, brightening the eyes and dispelling pathogenic influences, and nourishing Spleen Qi. This herb is most excellent."

Historical Context

The history and evolution of Qing Hao's use in Chinese medicine over the centuries

Qing Hao has one of the longest documented medicinal histories in Chinese medicine, stretching back over 2,000 years. It appears in the Wu Shi Er Bing Fang (Recipes for 52 Ailments), a Han-dynasty medical text from circa 168 BCE excavated from the Mawangdui tombs. The Shen Nong Ben Cao Jing listed it as a lower-grade herb for treating skin conditions and clearing Heat from the joints. The most historically significant passage comes from Ge Hong's (葛洪) Jin-dynasty text Zhou Hou Bei Ji Fang (Handbook of Prescriptions for Emergencies), which described soaking a handful of Qing Hao in water and wringing out the juice to treat malaria. This cold-extraction instruction, rather than boiling, proved to be the key insight that inspired Tu Youyou (屠呦呦) in the 1970s to use low-temperature ether extraction, successfully isolating the active compound artemisinin (qinghaosu, 青蒿素).

A notable botanical complexity surrounds this herb. Li Shizhen in the Ben Cao Gang Mu (1596) was the first to formally distinguish Qing Hao (the fragrant, blue-green herb) from Huang Hua Hao (the pungent-smelling, yellowish herb). Ironically, the plant species that actually contains artemisinin and is the official source in the Chinese Pharmacopoeia is Artemisia annua, which corresponds to Li Shizhen's 'Huang Hua Hao'. The botanical name 'Qing Hao' in modern taxonomy refers to Artemisia carvifolia, which does not contain artemisinin. This naming confusion has persisted for centuries due to the immense influence of the Ben Cao Gang Mu. Tu Youyou's 2015 Nobel Prize in Physiology or Medicine for discovering artemisinin cemented Qing Hao's place as perhaps the most globally significant single herb in the Chinese materia medica.

Modern Research

4 published studies investigating the pharmacological effects or clinical outcomes of Qing Hao

Systematic review of anti-malarial, immunosuppressive, anti-inflammatory, and anti-cancer properties of Artemisia annua (Systematic review, 2016)

Daddy NB, Kalisya LM, Bagire PG, Watt RL, Towler MJ, Weathers PJ. J Evid Based Complementary Altern Med, 2017, 22(4):872-881

This systematic review examined 46 studies from 1990 to 2016 covering the therapeutic properties of Artemisia annua. It confirmed the plant's well-established antimalarial effects via artemisinin and documented emerging evidence for anti-inflammatory, immunosuppressive, and anticancer activities linked to its sesquiterpene lactones and flavonoid compounds.

PubMed

Artemisinin antimalarials moderately affect cytochrome P450 enzyme activity in healthy subjects (RCT, 2007)

Asimus S, Elsherbiny D, Hai TN, Jansson B, Huong NV, Petzold MG, Simonsson US, Ashton M. Fundamental & Clinical Pharmacology, 2007, 21(3):307-316

In this randomized trial of 75 healthy adults receiving 5-day courses of different artemisinin compounds, researchers found that artemisinin initially inhibited CYP1A2 activity and then induced CYP3A and CYP2C19 activity by day 5. These findings demonstrate that artemisinin can affect the metabolism of co-administered drugs processed through these liver enzyme pathways.

PubMed

New clinical application prospects of artemisinin and its derivatives: a scoping review (Scoping review, 2023)

Wang J, Xu C, Liao FL, Jiang T, Krishna S, Tu Y. Infectious Diseases of Poverty, 2024, 13:4

This scoping review of 77 clinical studies examined the use of artemisinin and its derivatives beyond malaria, including anti-parasitic (35 studies), anti-tumor (16 studies), anti-inflammatory (12 studies), anti-viral (8 studies), and dermatological applications (7 studies). It identified promising results but called for more rigorous randomized controlled trials.

Randomized controlled trial of a traditional preparation of Artemisia annua L. in the treatment of malaria (RCT, 2004)

Mueller MS, Karhagomba IB, Hirt HM, Wemakor E. Transactions of the Royal Society of Tropical Medicine and Hygiene, 2004, 98(5):318-321

This open randomized controlled pilot trial tested traditional Artemisia annua tea preparations against quinine for uncomplicated malaria. Treatment produced rapid clearance of parasites and symptoms, with 74% cure rates at 7 days for the Artemisia groups compared to 91% for quinine. However, recrudescence rates were high, indicating that traditional monotherapy alone is insufficient.

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.