Roots and rhizomesTonifyingCurculiginis Rhizoma

Xian Mao (Common Vurculigo Rhizome)

A practical guide to Xian Mao: what it is, how Traditional Chinese Medicine uses it, the classical formulas it appears in, and who should be careful with it.

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Last reviewed Oct 29, 2026

Quick Facts

Latin Name	Curculiginis Rhizoma
Chinese Name & Pinyin	仙茅 · Xian Mao
Medicinal Part	Roots and rhizomes
The item	Xian Mao is the dried rhizome of the common curculigo plant. Yin Yang Huo (epimedium) and the look-alike du jiao lian rhizome are not this drug.
Nature and channels	Warm, acrid, slightly bitter. Enters the Kidney and Liver, with the Spleen in some records. Warm acrid slightly bitter warms the kidney yang and expels cold-damp.
Pharmacopoeia line	Supplements the kidney yang and strengthens the sinews and bones; expels cold and damp. Used for kidney yang insufficiency and cold-damp joint pain.
Pattern cues	Fear of cold and cold limbs. Sore weak low back and knees. Frequent long clear urine. Cold pain of the limbs and joints. Worse in cold. Cold hands and feet.
In this article	Xian Mao versus Yin Yang Huo. Warming yang and expelling cold-damp versus warming yang and strengthening sinews. Why yin-deficiency bodies should skip it. Home tea.

What Is Xian Mao?

Xian Mao (仙茅; Xiān Máo; Latin: Curculiginis Rhizoma; English: common curculigo rhizome) is the dried rhizome of a small perennial herb of the lycoris family that grows in rock crevices and waste slopes of southern hills — a brownish, finely wrinkled root dug in autumn by older folk and sun-dried for gentle daily care. It is warm, acrid with a slight bitter note, enters the Kidney and Liver channels (with the Spleen in some records), and its core actions are to warm and supplement the kidney yang, and to expel cold and damp. It is the gentle winter root for cold limbs and a cold low back. The usual amount is 3–10 g in a decoction, or 3–5 g as a food remedy. It is a medicinal piece, not a food to add to daily meals.

It is not Yin Yang Huo. Epimedium is also warm, acrid, and sweet — it supplements the kidney yang and strengthens the sinews and bones, better for kidney deficiency with weak bones and limbs; this curculigo rhizome is warm, acrid, and slightly bitter — it warms the kidney yang and expels cold-damp, better for cold-damp joint and limb pain. It is not a general tonic; it acts within clear patterns. In yin-deficiency with fire — dry mouth, tidal heat, night sweats — using it on your own is a poor match. Long-standing joint pain with swelling and heat, or weakness that keeps worsening, needs a clinic first. Do not take it yourself for a long time.

It is used most often for three patterns:

Kidney yang insufficiency — fear of cold and cold limbs, sore weak low back and knees, frequent long clear urine — after long sitting or too much cold drink
Cold-damp blockage — cold pain of the limbs and joints, hard to bend and stretch, worse in cold, cold hands and feet
Yin-deficiency with fire — dry mouth, tidal heat, night sweats — or heat-type joint pain — seek care / skip it

Warm, acrid, and warm-drying, it is not a daily "kidney-warming root" to keep increasing. Warming when there is no yang deficiency, or in a yin-deficient body, feeds the heat instead of helping.

When long sitting, cold drink, and age drain the kidney yang — the limbs run cold, the low back aches, the knees weaken, the urine comes long and clear — the body needs a gentle warm-and-build rather than a strong purge. Xian Mao is warm, acrid, and slightly bitter. It warms the kidney yang and expels cold-damp, which is why it appears in Er Xian Tang (Two Immortals Decoction)–type formulas. It warms more than it pushes. In yin-deficiency with fire, more makes it worse.

Xian Mao is not a catch-all kidney or cold root. In yin-deficiency with fire, in pregnancy, or without yang deficiency and cold-damp, using it alone is a poor match. Whether it belongs in a formula, and at what dose, should be decided by a licensed Chinese medicine practitioner after pattern diagnosis.

Xian Mao: Materia Medica Profile

Identification & Quality Standard

Curculiginis Rhizoma

Botanical Origin

The dried rhizome of Curculigo orchioides Gaertn.(Amaryllidaceae)

Production Regions

Primarily produced in the Chinese provinces of Guangdong, Guangxi, Sichuan.

Quality Requirements

Superior medicinal material has thick and long strip, firm texture, black-brown externally.

Macroscopic Features

Cylindrical, slightly curved, two ends are flat, 3~10cm long, 3~8mm diameter. Externally brown or black-brown, rough, wrinkled and uneven, with thin and dense discontinuous horizontal lines, and scattered faint small spotted lenticels. Remnants of root pieces have thin ends and thick middle rootlets grow thickly at one end of the rhizome, 3~6cm long, with extremely dense ringed horizontal lines, light and loose texture, soft but hard to break. Rhizome is firm and brittle, easily broken, flat fractured surface, slightly granular (steamed pieces are slightly transparent and horn-like), cortex is pale grayish-brown or reddish-brown due to gelatinization, relatively dark near the center. Slightly acrid odor, slightly bitter and acrid taste.

Main Regions and Quality Identification

Classic texts and trade experience favor rhizomes from several southwestern provinces, but quality still depends on variety, harvest time, processing, and storage. Good Xian Mao shows a cylindrical, slightly bent rhizome, brownish-brown to black-brown on the surface with longitudinal wrinkles and transverse pores, hard, with a horny pale-brown break, a faint fragrance, and a slightly bitter-acrid taste. Jiu Xian Mao is brownish-brown with a light wine smell and snaps more crisply than the raw piece. The common look-alike is the du jiao lian rhizome — its surface has rings and rootlet scars and its break is white, clearly different — so check carefully.

Traditional Properties & Historical Lineage

Nature, Flavour & Channel Tropism

Acrid; Hot; ToxicKidneyLiverSpleen

1. Records in Classic Materia Medica

Shen Nong Ben Cao Jing: first mentions it — "for cold qi of the heart and abdomen, wind-cold of the low back and feet that cannot stand long, and difficult urination."
Ming Yi Bie Lu: adds — "strengthens the sinews and bones, benefits the skin, frees the blood vessels, and disperses swelling."
Xin Xiu Ben Cao: "is used for wind-cold qi and a mouth and face drawn to one side."
Ben Cao Gang Mu: "supplements the san jiao, stops deficiency dysentery, and assists the ministerial fire."
De Pei Ben Cao: "paired with Gou Qi, for impotence; paired with Du Zhong, for cold pain of the low back and knees."
Zhong Hua Ben Cao: confirms — supplements the kidney yang, strengthens the sinews and bones, and expels cold-damp.

These records center on warming yang and drying damp — no modern medicine conclusions.

2. How Views of Its Nature Changed

Some doctors leaned on the supplementing side — a gentle yang tonic for long care; others stressed the cold-damp-expelling side — for cold pain of the limbs and joints; still others drew the line — it fits kidney yang insufficiency with cold-damp, not yin-deficiency with fire. The refinement gives it a targeted scope and keeps it from being taken as a catch-all.

Core Efficacies & Traditional Applications

Traditional Functions

Supplements kidney yang, strengthens sinew and bone, dispels cold-dampness.

1. Main Use 1: Warming and Supplementing the Kidney Yang

(1) Traditional action: supplementing the kidney yang and easing the discomfort of kidney-yang deficiency. (2) Typical patterns: fear of cold and cold limbs, sore weak low back and knees, impotence and spermatorrhea, frequent long clear urine. (3) Usual pairings: Yin Yang Huo and Ba Ji Tian to strengthen the kidney-yang supplement; Shu Di Huang and Shan Zhu Yu as yin partners — the "seeking yin within yang" idea — so the warm-drying does not go too far. (4) Not for self-use: yin-deficiency with fire — dry mouth, tidal heat, night sweats — the herb may worsen the discomfort.

2. Main Use 2: Expelling Cold and Damp

(1) Traditional action: driving the cold-damp from the limbs and joints and easing the pain of cold-damp blocking the channels. (2) Typical patterns: cold-damp blockage — cold pain of the limbs and joints, hard to bend and stretch, worse in cold, cold hands and feet. (3) Usual pairings: Du Huo and Wei Ling Xian to strengthen the cold-damp-expelling and channel-freeing; Gui Zhi and processed aconite-type herbs as warming partners — cold yields to warmth, so warming strengthens the cold-expelling. (4) Not for self-use: heat-type joint pain — red, swollen, hot joints — the herb may worsen the heat signs.

3. A Classic Pairing

Xian Mao pairs classically with Du Zhong: the curculigo rhizome warms the kidney yang and expels cold-damp; the eucommia bark supplements the liver and kidney and strengthens the sinews and bones — the curculigo boosts the eucommia's warmth, while the eucommia checks the curculigo's warm-dry side and adds the bone-strengthening — for kidney yang insufficiency with cold-damp, cold pain of the low back and knees, and weak legs. This pair belongs to a practitioner's pattern diagnosis — no casual self-pairing.

Modern Research

Modern research offers useful context, but Traditional Chinese Medicine prescribes on whole-pattern diagnosis rather than isolated compounds.

1. Main Chemical Constituents

Detected in the plant are curculigoside, curculigine, lycorine, polysaccharides, and flavonoids; curculigoside is the characteristic constituent and a focus of modern research. In vitro, some extracts show antioxidant and anti-inflammatory activity; in animals, model animals given the extract show some relief of kidney-yang-insufficiency signs and improved limb activity. Human clinical research is still scarce and no clear conclusion has formed.

2. Current Research Directions

Current work centers on two directions: the effects on the physiological mechanisms behind kidney-yang insufficiency — how it may act through hormone levels and metabolic state — and the validation of anti-inflammatory and pain-easing effects on joints and muscles. Some constituents appear to inhibit the release of inflammatory factors in experiments, but these results come mostly from animals and still need human verification.

3. Limitations of Current Research

Lab results are not clinical efficacy — animal results cannot be applied directly to people.
Extracts are not decoction pieces — experimental concentrations and doses differ greatly from the piece dose.
Doses and preparations vary between studies — results are hard to unify.
One component does not define the whole herb — the rhizome acts as a team of constituents.

Comparing Similar Herbs

1. What They Share

Both warm and supplement the kidney yang.
Both are used for kidney yang insufficiency — sore weak low back and knees, fear of cold and cold limbs.
Both appear in kidney-warming formulas and daily food-remedy scenes.
Both need constitution and dose care — yin-deficiency with fire should not overuse or use long-term.

2. Key Differences

Nature and flavor: Xian Mao is warm, acrid, and slightly bitter — leaning warm-dry; Yin Yang Huo is also warm, acrid, and sweet — calmer, without the marked dryness. Focus: Xian Mao warms the kidney yang and expels cold-damp — for cold pain of the limbs from cold-damp blockage; Yin Yang Huo warms the kidney yang and strengthens the sinews and bones, with a wind-dispersing side — more on sinew-bone care. Tendency: Xian Mao warms the yang, scatters cold, and dries damp — driving the yin cold and sorting the lower-burner yang flow; Yin Yang Huo warms the kidney yang and strengthens the sinews — supplementing the liver-kidney yang while helping the channels. Best fit: Xian Mao for kidney yang insufficiency with marked cold-damp — cold pain of the low back and knees, worse in cold, clearly cold hands and feet; Yin Yang Huo for kidney yang insufficiency with weak sinews and bones — sore weak low back and knees, numb limbs, weak sinews. Who should avoid: both — yin-deficiency with fire, dry mouth, tidal heat, night sweats; Xian Mao's warm-dry side is stronger, so caution is higher. Where you meet them: Xian Mao in cold-damp blockage formulas — medicated wines and external plasters for cold joint pain; Yin Yang Huo in liver-kidney deficiency formulas — tonic soups and pills for sinew-bone care.

3. One-Line Takeaway

In short, Xian Mao warms the yang, expels cold, and dries damp; Yin Yang Huo warms the yang and strengthens the sinews and bones. Both can serve kidney yang insufficiency — but they are not stand-ins for each other.

Classical Formulas Containing Xian Mao

Classic Formula 1: Er Xian Tang

Role of this herb: in Er Xian Tang (Two Immortals Decoction), Xian Mao is a joint monarch with Xian Ling Pi (Yin Yang Huo) — together warming the kidney yang and expelling cold-damp — with Dang Gui and Ba Ji Tian strengthening the yang-kidney supplement and harmonizing the qi and blood, and Huang Bai and Zhi Mu draining the deficiency heat and checking the warm-dry side. Alone, the curculigo cannot also harmonize the blood and drain the heat, and its warm-dry side may feed fire. Traditional focus: kidney yang insufficiency with stirring ministerial fire — the menopause-type state and related blood-pressure swings — sore weak low back and knees, alternating cold and heat, dizziness and tinnitus. Modern note: professional diagnosis first — never self-apply by the name.

Classic Formula 2: Xian Mao Wan

Role of this herb: in Xian Mao Wan (Curculigo Pill), Xian Mao is the monarch — warming the kidney yang and expelling cold-damp — with Cang Zhu drying damp and strengthening the spleen, Gou Qi nourishing the liver and kidney, and Che Qian Zi promoting urination — together warming, drying, and supplementing. Alone, the curculigo cannot cover the damp-drying and urination-promoting of the full pattern. Traditional focus: spleen-kidney deficiency with cold-damp blockage — cold pain of the abdomen, difficult urination, puffy limbs. Modern note: professional diagnosis first — never self-buy the pill and take it.

Formula vs. Single Herb

A formula is a coordinated whole — the pairings and doses are designed together, and a single herb cannot copy the full effect; a formula can cover several patterns at once and check a single herb's bias. The common misunderstanding is that a herb that works in a formula will work the same way alone — alone it may be too weak or too biased and bring discomfort. Do not self-formulate from web articles.

Diet & Daily Home Use

1. Home Tea

Example — Xian Mao and gouji berry tea: Xian Mao 3 g, Gou Qi 5 g, Da Zao 2 — rinse the curculigo, put all in a cup, add boiling water, cover 10 minutes, and re-steep until faint. Fit: gentle daily care for kidney yang insufficiency — fear of cold and cold limbs, sore weak low back and knees, mild symptoms. Not for: yin-deficiency with fire — may worsen dry mouth, tidal heat, and night sweats. Frequency: 2–3 times a week; no long continuous use.

2. Decoction and Processing Differences

The raw piece is more warm-dry and is mostly for clinical formulas; Jiu Xian Mao, processed with yellow rice wine, is gentler and better for home use. For cold-damp-expelling use, the raw piece may be decocted first 10–15 minutes so the constituents release well; Jiu Xian Mao can cook with the other ingredients. At home, use a clay or ceramic pot — not an iron pot — soak the pieces in clean water 30 minutes before cooking, cover with water 2–3 cm above the herbs, bring to a boil over a strong fire, then simmer about 20 minutes over a gentle fire. Different forms cannot be converted directly — the clinical piece dose differs greatly from the home food-remedy dose; do not copy it casually.

3. Dosage and How Long to Use

The classic range is 3–10 g, adjusted to the pattern by the practitioner; food-remedy amounts are 3–5 g, smaller, to avoid too much warm-dry. No long continuous use — generally no more than 10 days at a time, then a 2–3 week break before use again. Special groups — pregnancy, nursing, children, liver or kidney impairment — consult a practitioner or pharmacist first; no casual self-use.

Contraindications & Safety Warnings

1. Who Should Avoid It

Yin-deficiency with fire — dry mouth, tidal heat, night sweats, a red tongue with little coat — avoid; pregnancy and nursing — special bodies, insufficient safety evidence, be cautious; children — not fully developed, avoid strong warm herbs; liver or kidney impairment — metabolism may be affected, no self-use; allergy to the lycoris family — may react, be cautious.

2. Interactions and Diet Notes

Xian Mao may interact with anticoagulant, blood-pressure, and blood-sugar medicines — with an anticoagulant, for example, it may affect the blood-thinning effect — so people on these should consult a doctor or pharmacist first. No blanket "food clash" between ordinary foods is established, but certain herbs may interact with specific medicines. While using it, avoid too much spicy, greasy, or raw-cold food, which may affect the effect.

3. Side Effects and Overuse

Overuse may bring dry mouth, sore throat, and bound stools — fire signs — and some people may have dizziness or nausea. Stop and seek care at once for marked discomfort, an allergic reaction, persistent vomiting, trouble breathing, confusion, or a rapid worsening of symptoms. Control the dose strictly — never raise it to chase a stronger effect.

Frequently Asked Questions About Xian Mao

What is Xianmao? Is it the same as Yinyanghuo or Bajitian?

Xianmao is the dried rhizome of Curculigo orchioides, Latin name Curculiginis Rhizoma. It is a common Chinese medicine centered on tonifying kidney yang, strengthening the sinews and bones, and dispelling cold-damp. Yinyanghuo tonifies kidney yang while dispelling wind. Bajitian tonifies kidney yang while dispelling wind-damp. They cannot be used interchangeably in equal amounts. Prescribe as Xianmao. Caution in yin deficiency with fire effulgence.

What are the composition and effects of Xianmao?

Pharmacopoeial name Xianmao, Latin Curculigo orchioides Gaertn. Pungent in taste, hot in nature, toxic, enters the Kidney, Liver and Spleen meridians. Functions to tonify kidney yang, strengthen the sinews and bones, and dispel cold-damp. Used for impotence with cold essence, flaccid sinews and bones, cold bi of the waist and knees, and yang deficiency cold diarrhea. Tonifies the kidney and assists yang.

How to choose between raw and processed? Can Yinyanghuo replace it?

Rhizome is used raw. Yinyanghuo emphasizes dispelling wind rather than strongly strengthening the sinews, and cannot replace it in equal amounts. Commercial products are standardized; do not adjust arbitrarily.

What is the dosage of Xianmao? Can it be used daily as a yang-assisting tea?

Decoction, 3-10g. Modern use requires physician-determined dosage. It is not a year-round "Xianmao tea." Toxic. Pregnancy will be further injured by prolonged use. Impotence requires short-term, physician-determined dosage and cannot replace evaluation.

What are the contraindications of Xianmao? Can pregnant women use it?

Toxic. Not suitable for yin deficiency with fire effulgence. Pregnant women require physician evaluation. Stop if dry mouth or irritability with heat occur. Seek immediate medical care for severe impotence or high fever.

Can Xianmao tonify kidney yang, strengthen the sinews, and dispel cold-damp?

It can assist impotence with cold essence, flaccid sinews and bones, cold bi of the waist and knees, and yang deficiency cold diarrhea. It tonifies kidney yang, strengthens the sinews and bones, and dispels cold-damp, but is not a specific remedy for all impotence or all flaccidity.

Can Xianmao be taken daily as a yang-assisting or sinew-strengthening tea?

Kidney yang deficiency can be used short-term in formulas; pregnancy will be further injured. The idea that "Xianmao must assist yang" cannot replace evaluation. Tonifying kidney yang and strengthening the sinews requires physician-determined formulation and dosage.

How to choose between Xianmao, Yinyanghuo, Bajitian, Roucongrong, and Buguzhi?

Xianmao tonifies kidney yang and strengthens the sinews, suited to flaccidity. Yinyanghuo tonifies kidney yang and dispels wind. Bajitian tonifies kidney yang and dispels wind-damp. Roucongrong tonifies kidney yang and moistens the intestines. Buguzhi tonifies the kidney and assists yang while stopping diarrhea. Choose Xianmao for assisting yang; Yinyanghuo for dispelling wind; Bajitian for dispelling wind-damp; Roucongrong for moistening the intestines; Buguzhi for stopping diarrhea. Pattern differentiation applies, but large doses of Xianmao are contraindicated in yin deficiency with fire effulgence.

How is Xianmao commonly modified? What is a representative usage?

Modifications depend on the pattern. Add Yinyanghuo for impotence; add Bajitian for flaccidity. Specify Xianmao; do not substitute Yinyanghuo in equal amounts for strengthening the sinews.

How to select and store Xianmao?

Choose regular Chinese medicinal materials with intact rhizomes. Discard if moldy, damp, or abnormal in odor. Store in a dry place. Purchase "Xianmao"; do not substitute Yinyanghuo or Bajitian in equal amounts for tonifying kidney yang, strengthening the sinews, and dispelling cold-damp.

Related Products

Nong's Xian Mao (Curculigo Rhizome) Single Herb 5:1 Concentrated Granules $53.35

Hoi Tin Xian Mao (Curculigo Rhizome) Single Herb 10:1 Concentrated Granules, 100 g TCM Herbal Supplement

Hoi Tin Xian Mao (Curculigo Rhizome) Single Herb 10:1 Concentrated Granules $26.41

Medical Disclaimer — This article is provided for educational purposes only and describes traditional Chinese medicine concepts. It is not medical advice, and it is not intended to diagnose, treat, cure or prevent any disease. Always consult a qualified practitioner before using any herb, particularly if you are pregnant, nursing, taking medication or managing a diagnosed condition.