Overview
Root / Rhizome at a Glance
Roots are the plant's storage organ and its chemical vault. Everything the plant banks for the winter is held below ground: starches and inulin, alkaloids, saponins, and resins.
That concentration is why root medicine tends to be the deepest-acting and slowest in a materia medica. Where a leaf infusion works quickly and lightly, roots are the material behind the adaptogens, the alteratives, and most of the bitter digestive tonics.
The chemistry sorts into a few recognisable groups. Ginseng and astragalus store triterpene saponins; goldenseal stores isoquinoline alkaloids such as berberine; licorice carries glycyrrhizin; and dandelion and burdock store inulin, a polysaccharide that feeds gut bacteria rather than the person eating it.
Roots are lifted in autumn or very early spring, once the top growth has died back and the plant's energy has drawn downward. A root dug in high summer is a thinner medicine.
Because the tissue is dense and woody, most roots need decoction rather than infusion, or a strong enough alcohol to pull the resins out. That is the practical difference between a root and every other part of the plant.
Working Notes
Dig in autumn, not spring, if you can choose. — The plant has spent the season loading the root; by spring it is already spending it again on new growth.
Wash fast, dry slow. — A long soak leaches water-soluble constituents straight into the sink, so scrub quickly, slice while fresh, and dry gently; a whole root dried intact tends to mould from the inside.
Assume a lower dose than the leaf. — Root chemistry is concentrated, and alkaloid-bearing roots in particular have a much narrower window than the aerial parts of the same plant.
Match the solvent to the fraction. — If the tradition says tincture, there is usually a resin or an alkaloid behind that instruction, and a tea will quietly under-deliver.
Preparation
How Root Is Prepared
Root tissue is dense and woody, so almost every root preparation is a way of getting past that density without cooking off what you came for.
01
Decoction
The default. Chop or crush the dried root, cover with cold water, bring slowly to a simmer, and hold it there 15–30 minutes with the lid on.
Starting cold and rising slowly draws more out than dropping root into boiling water. Strain while hot.
02
Tincture
For resinous and alkaloid-rich roots, alcohol is not optional — it is the only solvent that takes the active fraction. Dried root is typically macerated at 1:5 in 45–60% alcohol; resinous roots like kava want the higher end.
03
Powder & Capsule
Roots dry hard, so grind them while brittle rather than leathery. Powdering exposes far more surface area — worth remembering that a capsuled root dose is not interchangeable with the same weight of cut root in a tea.
04
Cold Infusion
Reserved for mucilaginous roots, where heat degrades the very slime you want. Steep in cold water 6–8 hours, then strain without pressing.
It also leaves most of the bitterness behind, which is sometimes the point.
Root / Rhizome Medicines
Herbs Used for Their Root
68 herbs draw their medicine from the root or rhizome, the deep and slow end of the materia medica.
Action
Abuta Cissampelos pareira Abuta is a tropical climbing vine of the moonseed family, known in South America as the midwives' herb. Its root and vine are used for menstrual cramps, heavy bleeding and pain, and its alkaloids include curare-like muscle relaxants.
American Ginseng Panax quinquefolius American ginseng is a small woodland herb of eastern North America whose slow-growing root is a cooling tonic in Chinese medicine. It is studied for fatigue, memory, blood-sugar control and colds.
Angelica Angelica archangelica Angelica is a tall, aromatic plant of the carrot family whose root and seeds are used as a warming digestive bitter and antispasmodic, and to flavour gin and liqueurs. Its root is rich in coumarins such as osthole and imperatorin.
Ashwagandha Withania somnifera Ashwagandha is a small shrub of the nightshade family whose root is a classical Ayurvedic tonic for strength, vitality and sleep. Its withanolides are studied for their effects on stress, anxiety, sleep and cortisol.
Asian Ginseng Panax ginseng Asian ginseng is a slow-growing woodland herb of north-east Asia whose root is one of the most valued tonics in Chinese medicine. It is taken for energy, stamina and resilience to stress, and is studied for blood sugar, fatigue, erectile function and memory.
Astragalus Astragalus mongholicus Astragalus is a perennial legume whose dried root, huang qi, is one of the principal tonic herbs of Chinese medicine, taken to strengthen qi and the body's defences. The root contains astragaloside IV, polysaccharides and isoflavones such as calycosin and formononetin.
Babul Vachellia nilotica Babul is a thorny acacia tree of Africa, Arabia and South Asia whose tannin-rich bark is used as an astringent. It is a traditional gargle for bleeding gums, a wash for wounds and a remedy for loose stool, and its twigs are chewed as toothbrushes.
Bael Aegle marmelos Bael is a thorny, sacred tree of the citrus family native to the Indian subcontinent. Its unripe fruit is one of Ayurveda's main remedies for diarrhoea and dysentery, and its ripe pulp is eaten as a cooling food and gentle laxative.
Barberry Berberis spp. Barberry is a spiny shrub whose yellow root and bark are rich in the bitter alkaloid berberine. It is used as a digestive and liver tonic and for diarrhoea, and its fruit extract has been studied for blood lipids and blood sugar.
Bay Bean Canavalia rosea Bay bean is a sprawling legume of tropical beaches whose root, leaf and seed are used in coastal folk medicine for rheumatism, wounds, colds and constipation. Its dried leaf is also smoked as a mild relaxant and tobacco substitute.
Black Cohosh Cimicifuga racemosa Black cohosh is a tall woodland perennial of eastern North America whose rhizome is one of the most widely used herbal remedies for hot flushes and other menopausal symptoms. Its best-studied preparations are standardised rhizome extracts.
Blue Cohosh Caulophyllum thalictroides Blue cohosh is a woodland perennial of eastern North America whose root was a traditional remedy for menstrual pain, childbirth and rheumatism. It contains nicotinic alkaloids, including N-methylcytisine, and is not used in pregnancy.
Bupleurum Bupleurum falcatum Bupleurum is a perennial of the carrot family whose root, chai hu, is one of the central herbs of Chinese medicine, used for the liver and for fevers. Its saikosaponins have been studied for anti-inflammatory and liver-protective effects.
Burdock Arctium lappa Burdock is a large Eurasian biennial whose root is eaten as a vegetable and used in Western herbal medicine for the skin, digestion and joints. The root is rich in inulin, and the fruit, used in Chinese medicine, contains the lignans arctiin and arctigenin.
Calamus Acorus calamus Calamus, or sweet flag, is an aromatic wetland plant whose rhizome is a warming digestive bitter and, as vacha in Ayurveda, a herb for memory and speech. Its essential oil carries β-asarone, in amounts that vary widely between types of the plant.
Cat's Claw Uncaria tomentosa Cat's claw is a woody Amazonian vine whose inner bark and root are used for inflammation, arthritis and immune support. Its bark carries oxindole alkaloids and quinovic acid glycosides.
Chinese Skullcap Scutellaria baicalensis Chinese skullcap is a perennial herb of the mint family whose dried root, huang qin, has been a Chinese medicine for at least 2,000 years. It is used for fever, infections, allergies and inflammation, and its root is rich in the flavones baicalin and baicalein.
Clavo Huasca Tynanthus panurensis Clavo huasca is a clove-scented Amazonian vine whose bark and wood are steeped in spirit as an aphrodisiac and a remedy for rheumatic pain. Its bark carries eugenol, bound mainly as a glycoside, along with verbascoside.
Codonopsis Codonopsis pilosula Codonopsis is a twining bellflower whose sweet root, dang shen, is a gentle qi tonic in Chinese medicine for fatigue, poor appetite and weak digestion. Its polysaccharides are studied for effects on immunity and the gut.
Coleus Coleus barbatus Coleus is an aromatic herb of the mint family grown for its root, the source of forskolin. It is used for blood pressure, breathing complaints and weight management, and forskolin supplements are studied for eye pressure in glaucoma.
Comfrey Symphytum officinale Comfrey is a large, bristly perennial of the borage family, long known as knitbone. Its root and leaf are made into ointments, creams and poultices for sprains, bruises, sore muscles and joints, and it is used on the skin only because it contains liver-toxic pyrrolizidine alkaloids.
Coptis Coptis chinensis Coptis is a small Chinese woodland plant whose intensely bitter yellow rhizome, huang lian, is a classical remedy for dysentery and inflammatory 'heat'. It is a major plant source of berberine, an alkaloid studied for blood sugar, blood lipids and gut infections.
Corydalis Corydalis yanhusuo Corydalis is a small tuberous plant of the poppy family whose yellow tuber, yan hu suo, is a classic Chinese remedy for pain. Its alkaloids, chiefly tetrahydropalmatine, have been studied for pain relief, sedation and drug craving.
Couchgrass Elymus repens Couchgrass is a creeping perennial grass whose white rhizome is a traditional urinary remedy, taken as a tea to increase urine flow and soothe cystitis and urethritis. The rhizome is rich in the fructan triticin and the sugar alcohol mannitol.
Cryptolepis Cryptolepis sanguinolenta Cryptolepis is a West African climbing shrub whose yellow root is taken as a bitter tea for malaria, fever and infections. Its main alkaloid, cryptolepine, colours the root and has been studied for antimalarial and antibacterial activity.
Dan Shen Salvia miltiorrhiza Dan shen is the red root of a Chinese sage, used in Chinese medicine to promote blood circulation and support the heart. It contains tanshinones such as tanshinone IIA and water-soluble salvianolic acids.
Dandelion Taraxacum officinale Dandelion is a common perennial weed whose leaf and root are both food and medicine. The bitter root is taken for digestion and the liver, and the potassium-rich leaf as a gentle diuretic.
Devil's Claw Harpagophytum procumbens Devil's claw is a trailing plant of the Kalahari whose fleshy secondary root tubers are used for joint pain, back pain and poor digestion. Its iridoid glycoside harpagoside is the marker compound in the standardised extracts studied for low back pain and osteoarthritis.
Devil's Club Oplopanax horridus Devil's club is a spiny shrub of the Pacific Northwest rainforest and a relative of ginseng. Its root and stem bark are among the most important medicines of the region's Indigenous peoples, used for colds, infections, wounds and diabetes.
Dong Quai Angelica sinensis Dong quai is the aromatic root of Angelica sinensis, a blood tonic in Chinese medicine used for menstrual complaints, period pain and anaemia. The root is rich in ferulic acid and the phthalide ligustilide.
Echinacea Echinacea purpurea Echinacea, or purple coneflower, is a North American prairie perennial whose root and flowering tops are taken for colds and upper respiratory infections. It carries alkylamides and caffeic acid derivatives such as cichoric acid.
Eleuthero Root Eleutherococcus senticosus Eleuthero, or Siberian ginseng, is a thorny shrub of northeastern Asia whose root is taken as an adaptogen for stamina, stress and fatigue. Its marker compounds are the eleutherosides, and its root polysaccharides have been studied for their effects on the immune system.
Erva Tostão Boerhavia diffusa Erva tostão is a sprawling tropical herb whose root is used as a diuretic and a tonic for the liver and kidneys. In Ayurveda it is punarnava, a classical rejuvenating herb for swelling and fluid retention.
Fennel Foeniculum vulgare Fennel is a tall, anise-scented herb of the carrot family, grown for its seeds and leaves. The seed is a classic carminative for wind, bloating and digestive cramping, and a traditional aid to milk flow; its oil is rich in anethole.
Garlic Allium sativum Garlic is a pungent bulb used worldwide as food and medicine. Its sulfur compounds, chiefly allicin, are the basis of its traditional use for the heart and circulation, cholesterol, colds and infections.
Gentian Gentiana lutea Gentian is a tall yellow-flowered mountain plant of central and southern Europe whose root is the classic bitter of Western herbal medicine. The root's bitter compounds, gentiopicroside and amarogentin, are taken before meals to stimulate appetite and digestion.
Ginger Zingiber officinale Ginger is the aromatic rhizome of Zingiber officinale, a spice and warming digestive herb. It is best known for easing nausea, including the nausea of early pregnancy, and is also used for period pain, bloating and joint pain.
Goldenseal Hydrastis canadensis Goldenseal is a small woodland plant of eastern North America whose bright yellow rhizome is used as a bitter and as a remedy for inflamed mucous membranes and gut infections. It is rich in the alkaloids berberine and hydrastine, and it slows the breakdown of some prescription drugs.
Hydrangea Hydrangea arborescens Wild hydrangea (Hydrangea arborescens) is an eastern North American shrub whose root was an Eclectic remedy for urinary gravel, painful urination and irritation of the bladder and kidneys.
Iris Iris versicolor Blue flag (Iris versicolor) is a wetland iris of eastern North America whose rhizome is a bitter, low-dose liver and lymphatic herb. Nineteenth-century Eclectic physicians used it for sluggish digestion, chronic skin conditions and glandular swelling.
Isatis Isatis indigotica Isatis is a yellow-flowered plant of the mustard family and the Chinese source of indigo dye. Its root, Ban Lan Gen, is one of the most widely used Chinese herbs for colds, sore throats and feverish viral illness.
Japanese Knotweed Reynoutria japonica Japanese knotweed is a tall perennial of the knotweed family whose root and rhizome, Hu Zhang, is used in Chinese medicine for jaundice, joint pain and cough. The root is rich in polydatin, a bound form of resveratrol, and the plant is also a notorious invasive weed outside its native East Asia.
Kava Piper methysticum Kava is a Pacific Island shrub whose rootstock is prepared as a relaxing ceremonial and social drink. Its kavalactones are studied for easing anxiety.
Kid Ginseng Pseudostellaria heterophylla Kid ginseng is the small tuberous root of a woodland herb in the carnation family, known in Chinese medicine as tai zi shen. It is a mild qi tonic for fatigue, poor appetite and dry cough, and its characteristic compounds are cyclic peptides such as heterophyllin B.
Licorice Glycyrrhiza glabra Licorice is the sweet root of Glycyrrhiza glabra, a legume used in Chinese, Ayurvedic and European medicine. It is taken for indigestion, coughs, sore throats and stomach ulcers, and its glycyrrhizin raises blood pressure with regular use.
Maca Lepidium meyenii Maca is a high-Andean root vegetable in the mustard family, eaten as a staple food and taken as a tonic for libido, fertility and energy. Its characteristic constituents are macamides, macaenes and glucosinolates.
Marshmallow Althaea officinalis Marshmallow is a tall, soft-leaved perennial of damp and salty ground whose root is rich in mucilage. Herbalists use it as a soothing demulcent for a dry cough and sore throat, an irritated digestive tract, the urinary tract and inflamed skin.
Mugwort Artemisia vulgaris Mugwort is a tall, aromatic perennial of the daisy family, known in medieval Europe as the mother of herbs. It is used as a digestive bitter, a menstrual herb and a dream herb, and its dried leaves are the moxa burned in moxibustion.
Muira Puama Ptychopetalum olacoides Muira puama is a small Amazonian tree whose root and bark, known in Brazil as 'potency wood', are a traditional tonic for libido, fatigue and nervous weakness. Its alcoholic extract has been studied in animals for memory, mood and stress.
Mullein Verbascum thapsus Mullein is a tall, woolly-leaved biennial whose flowers and leaves are a traditional remedy for dry coughs, sore throats and catarrh. Its soothing character comes from mucilage, alongside iridoids such as aucubin and the phenylethanoid verbascoside.
Notoginseng Panax notoginseng Notoginseng is a ginseng-family herb whose root, san qi, is used in Chinese medicine both to stop bleeding and to move stagnant blood. Its saponins, led by ginsenoside Rg1, ginsenoside Rb1 and notoginsenoside R1, are studied for stroke recovery, angina and platelet function.
Passionflower Passiflora incarnata Passionflower is a North American climbing vine whose leaves and stems are taken as a calming herb for anxiety, restlessness and poor sleep. Its main constituents are flavonoids such as vitexin and isovitexin.
Peony Paeonia lactiflora Peony (Paeonia lactiflora) is a perennial herb whose root is one of the principal medicines of Chinese herbal medicine, used as a blood tonic, for the liver and for women's complaints. A root extract rich in paeoniflorin is used in China alongside standard drugs for rheumatoid arthritis.
Rehmannia Rehmannia glutinosa Rehmannia is a low, hairy perennial herb of northern China whose root, di huang, is one of the foundational tonics of Chinese medicine. The uncured root is used to cool heat and the wine-steamed root to build blood, and its iridoid catalpol and root polysaccharides are its most studied constituents.
Rhodiola Rhodiola rosea Rhodiola is a hardy perennial of cold mountain and Arctic regions whose rose-scented root is used as an adaptogen for stress-related fatigue. The root contains salidroside and the rosavins, and standardised extracts have been tested for fatigue, low mood and endurance.
Rhubarb Rheum palmatum Rhubarb root is the dried rhizome of Chinese rhubarb, a giant perennial of the buckwheat family. Rich in anthraquinones and tannins, it is a bitter tonic in small doses and a laxative in larger ones, and in China it is also used in hospital care for acute pancreatitis.
Samambaia Polypodium leucotomos Samambaia is a tropical American fern, sold as Polypodium leucotomos, whose standardised extracts are taken by mouth to help protect the skin from sun damage. The extract is rich in phenolic acids such as caffeic and ferulic acid, antioxidants studied for their effects on UV injury to the skin.
Sarsaparilla Smilax spp. Sarsaparilla is the root and rhizome of several climbing Smilax vines from the tropics of the Americas and Asia. It is a traditional remedy for psoriasis and other skin complaints, gout and rheumatism, and chronic infection, and is rich in steroidal saponins and the flavonoid astilbin.
Shatavari Asparagus racemosus Shatavari is a climbing asparagus whose tuberous roots are one of Ayurveda's most valued tonics for women, used for menstrual and menopausal complaints and to support breast-milk supply. Its main constituents are steroidal saponins called shatavarins.
Spikenard Aralia racemosa American spikenard (Aralia racemosa) is a large woodland herb of the ginseng family, native to eastern North America. Its aromatic, balsamic root is a traditional remedy for coughs and chest complaints, and Native American peoples used it widely for lung disease, wounds and as a tonic.
Stinging Nettle Urtica dioica Stinging nettle is a perennial herb covered in stinging hairs, valued as a mineral-rich food and medicine. Its leaf is used for hay fever, joint pain and blood sugar, and its root for an enlarged prostate.
Suma Pfaffia paniculata Suma is a South American vine whose deep root is taken as a general tonic for energy, stress and sexual vitality, and is sold as Brazilian ginseng. The root is rich in saponins called pfaffosides and in the ecdysteroid 20-hydroxyecdysone.
Tick Trefoil Desmodium spp. Tick trefoil is the common name for Desmodium, a large genus of tropical legumes with clinging seed pods. Two species are used in medicine: D. adscendens, a West African and South American remedy for asthma, and D. gangeticum, the Ayurvedic root Salaparni.
Turmeric Curcuma longa Turmeric is a tropical plant in the ginger family, grown for its bright orange rhizome, which is used as a spice, a dye and a medicine. Its yellow curcuminoids, above all curcumin, have been studied for inflammation, joint pain and blood sugar.
Valerian Valeriana officinalis Valerian is a tall European perennial whose strong-smelling root is one of the best-known herbal sedatives. It is used for sleeplessness, nervous tension and restlessness, and its valerenic acid acts on GABA-A receptors in the brain.
Wild Yam Dioscorea villosa Wild yam is a twining woodland vine of eastern North America whose rhizome is used as an antispasmodic for colic and menstrual cramps. Its rhizome contains diosgenin, a steroidal sapogenin once used to manufacture hormones.
Wireweed Sida acuta Wireweed is a tough, wiry tropical weed of the mallow family, used across Africa, Asia and the Americas as a folk remedy for fever and malaria. It contains the alkaloid cryptolepine, which is active against malaria parasites in laboratory studies.
Yellow Dock Rumex crispus Yellow dock is a common dock whose root is used in Western herbal medicine as a gentle laxative, a bitter digestive and an alterative for chronic skin complaints. The root contains anthraquinones such as emodin and chrysophanol, which carry its laxative action.
No herbs match these filters.
Phytochemistry
Root Phytochemicals
Roots store rather than manufacture. The chemistry here is dense, often bitter or acrid, and frequently locked into tissue that water alone will not open.
Alkaloids Nitrogen-containing bases, usually bitter and physiologically potent even in small amounts.
Roots are the classic alkaloid reservoir, which is also why root doses run lower than leaf doses.
Found in GoldensealKannaCat's Claw
View compound class →Saponins Soap-like glycosides that foam in water and improve the absorption of everything alongside them.
They underpin much of the adaptogenic and hormonally active root tradition.
Resins & Kavalactones Lipid-soluble fractions that water barely touches.
A root with a resinous fraction needs alcohol, oil, or emulsion — a water infusion leaves the active part in the pot.
Found in KavaMuira Puama
Volatile Oils The aromatic, carminative fraction — warming, pungent, and easily lost.
Diterpenes Larger terpene skeletons, often colored, that give certain roots their pigment and much of their circulatory or anti-inflammatory activity.
Found in Dan Shen
View compound class →Polysaccharides & Inulin Long-chain sugars that pull into hot water and feed gut flora.
They give many roots their faintly sweet finish and their prebiotic, immune-modulating reputation.
Found in ElderberryFish Mint
Tannins Astringent polyphenols that bind protein and tighten tissue.
Common in root bark especially, and the reason an over-simmered root turns puckering and hard to drink.
Bitter Principles A functional rather than chemical class — the compounds that trigger the bitter reflex and, with it, digestive secretion.
Bitter roots are taken before food, not after.
Found in Milk ThistleMullein
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