Journal · Herbalism · What it is
Materia Medica: What It Is and the 12 Herbs Beginners Study First
A materia medica is an herbalist's reference of plant monographs: the 10 fields of an entry, 12 first herbs with an honest line each, and the U.S. legal line.
Valérie Fabre, Founder & Director, Harmonika Institute · September 13, 2026 · 9 min read
Key takeaways
- A materia medica is a reference of plant monographs. One entry per herb, with 10 standard fields: botanical name, family, part used, actions, energetics, constituents, preparations, dose, safety and sources.
- Twelve herbs carry most beginner study. Chamomile, peppermint, nettle, lemon balm, hawthorn, thyme, ginger, echinacea, calendula, dandelion, elder and plantain recur in almost every first-year syllabus.
- Students write their own, not copy one. Our phytotherapy curriculum builds a personal repertoire of 80 to 100 monographs across the program, 40 in the first monograph module.
- The preparation changes the plant. Our course notes give one rule: infusion for flowers and leaves, decoction for roots and bark, tincture for concentration, powder for daily use.
- Energetics is tradition, not evidence. Warming, cooling, drying and moistening are a classification system with 2,000 years of use and no laboratory measure.
- U.S. law shapes the entry. Under DSHEA, an herbalist may describe how a plant supports normal function; naming a disease turns advice into unlicensed practice.
Ask a working herbalist to show you their materia medica and you will be handed a binder, a card index or a battered notebook, never a printed book. It is the record of every plant they have studied, tasted, prepared and watched a client use, written in their own words. The word sounds like Latin because it is: materia medica, the materials of medicine, the title of a Greek physician's plant catalogue from the first century that herbalists have been rewriting ever since. The first thing a beginner learns is that it is a verb as much as a noun.
This article explains what goes in an entry, which plants beginners study first and where U.S. law draws the line. It does not cover how to find a class or a school; that is in our guide to herbalism classes near you. And the training paths and hours behind a career are in how to become a herbalist.
What is a materia medica?
A structured reference describing each plant a practitioner uses, one monograph at a time. The classical ones, from Dioscorides in the first century to the German Commission E monographs of the 1980s and 1990s, were written for others to consult. The one that matters to a student is the one they write themselves, because writing a monograph is how a plant moves from a name on a list to something the hands and nose recognise.
Our phytotherapy curriculum is built around exactly that. Module 2 covers a core repertoire of 40 herbs with hands-on identification; module 4 adds 40 to 60 more with monograph practice. By certification a student has 80 to 100 entries in their own hand. The naturopathy course notes that sit alongside describe the same discipline in one sentence: each plant has active principles that act on the body, and the practitioner's job is to know which plant, which part and which preparation.
What does one entry contain?
Ten fields, in a fixed order, so that any entry can be compared with any other. Beginners skip the boring ones, botanical name and sources, and those two separate an herbalist from a person who read a blog.
- 1
Botanical name and family
Latin binomial, e.g. Matricaria chamomilla, Asteraceae. Common names are ambiguous; "chamomile" alone could be three plants.
- 2
Part used
Flower, leaf, root, bark, seed or aerial parts. Nettle leaf and nettle root are different entries with different uses.
- 3
Actions
The traditional verbs: carminative, nervine, diaphoretic, bitter. A shared vocabulary that lets herbalists compare plants.
- 4
Energetics
Warming or cooling, drying or moistening, and taste. A classification from tradition, recorded as such.
- 5
Constituents
The main chemical groups: volatile oils, flavonoids, tannins, mucilage. This is where evidence enters, when it exists.
- 6
Preparations and dose
Infusion, decoction, tincture, syrup, oxymel, infused oil, and the usual quantities for each.
- 7
Safety and interactions
Contraindications, pregnancy, known drug interactions, toxic dose. The field that is never left blank.
- 8
Sources and personal notes
Which references the entry draws on, and what the student observed with their own senses and their own clients.
Which 12 herbs do beginners study first?
The dozen below. Six of them, nettle, chamomile, peppermint, hawthorn, thyme and lemon balm, are the plants our naturopathy course notes put in front of first-year students in a tasting workshop; the other six are the ones nearly every U.S. syllabus adds. The honest line is what we tell students the evidence and the law allow.
| Herb | Part used | Traditional use | First preparation | One honest line |
|---|---|---|---|---|
| Chamomile, Matricaria chamomilla | Flower | Digestive calm, restlessness, sleep | Infusion, 5 to 10 min covered | Well tolerated; small trials on sleep and mild anxiety; ragweed-family allergy possible |
| Peppermint, Mentha × piperita | Leaf | Digestion, nausea, alertness | Infusion | Enteric-coated oil has trial support for gut discomfort; the tea is pleasant and mild |
| Nettle, Urtica dioica | Leaf | Mineral-rich tonic, fatigue | Infusion, long steep | Nutritious and safe; the remineralising claim rests on mineral content, not trials |
| Lemon balm, Melissa officinalis | Leaf | Calm, digestion under stress | Infusion, fresh if possible | Small trials on mood and sleep; loses aroma when dried too long |
| Hawthorn, Crataegus monogyna | Flower, leaf, berry | Heart and emotions, in the tradition | Infusion or tincture | Studied in Europe for heart function; anyone with a heart condition or on heart medication goes to their physician, not to tea |
| Thyme, Thymus vulgaris | Aerial parts | Respiratory comfort, kitchen antiseptic | Infusion or syrup | Volatile oil is antimicrobial in the dish; the tea is a safe winter drink, not a treatment |
| Ginger, Zingiber officinale | Rhizome | Nausea, warmth, digestion | Decoction, 15 to 20 min | One of the few with consistent trial support, for nausea; may interact with blood thinners |
| Echinacea, Echinacea purpurea | Root, aerial parts | Winter resilience, in the tradition | Tincture | Trials are mixed and mostly negative for prevention; a modest effect on duration is possible |
| Calendula, Calendula officinalis | Flower | Skin, minor irritation | Infused oil or salve | Safe topically; small trials on skin comfort; the classic first medicine-making project |
| Dandelion, Taraxacum officinale | Root, leaf | Bitter, digestion, gentle diuretic (leaf) | Root decoction, leaf infusion | The bitter taste is the point; the detox claim is not a measurable one |
| Elder, Sambucus nigra | Flower, ripe berry | Winter comfort, warmth | Flower infusion, berry syrup | Small trials on cold duration; raw berries, leaves and stems are toxic and must be cooked or excluded |
| Plantain, Plantago major | Leaf | Skin, insect bites, soothing | Poultice, infused oil | Safe and everywhere underfoot; the first plant students identify in the field |
From the training floor
In the tasting workshop, students choose one plant from the seven on the table by instinct before the names are revealed, then check whether it matches what they came in needing. Most are startled by how often it does. We do not treat that as evidence of anything. We treat it as the moment a plant stops being a word, which is what a materia medica is for.
Why does the preparation change the plant?
Because different solvents pull out different constituents, and heat changes some of them. Our naturopathy course notes give the beginner's rule in four lines: infusions extract the active principles of flowers and leaves, as with chamomile for relaxation and mint for digestion; decoctions are for the hard parts, roots and bark, as with ginger; macerations and tinctures in alcohol or glycerine give a more concentrated action, as with echinacea; and powders and capsules are dried plant for daily use, as with turmeric.
The workshop recipe is just as plain: one tablespoon of dried plant per cup, steep 5 to 10 minutes, strain, and drink slowly enough to notice taste and sensation. A monograph that lists a preparation the student has never made is a copied monograph, which is why medicine-making has its own module in our curriculum before the second set of monographs.
How do students build their own materia medica?
One plant a week, in the same order every time: identify it, taste it, prepare it two ways, read three references, write the entry, revise it after use. Forty entries written in a weekend are forty summaries of other people's books; one a week for a year is a working reference.
- Identify in the field or the market. Leaf shape, smell, habitat, look-alikes. Elder versus water hemlock is a lesson taught with photographs and then with the plants.
- Prepare two ways. An infusion and a tincture, or a decoction and a syrup. Note colour, smell, strength and shelf life.
- Read three sources and disagree with one. A traditional herbal, a modern monograph and a safety reference. Where they conflict, the entry says so.
- Revise after use. What clients reported, what the student noticed, what was wrong in the first draft. Dated, in ink.
Where is the legal line for herbal recommendations in the U.S.?
At the name of a disease. No state licenses herbalists, so there is no licence to lose, but the practice of medicine is licensed everywhere and the boundary is the claim. Under the Dietary Supplement Health and Education Act of 1994, a plant product can carry a structure-or-function statement, "supports restful sleep", with the standard disclaimer that the FDA has not evaluated it. It cannot carry a disease claim, "treats insomnia", without becoming an unapproved drug. The same distinction applies to what an herbalist says across a table.
Scope of practice
An herbalist without a medical licence does not diagnose, does not treat a named condition, does not tell a client to stop or change a medication, and labels any product under FDA supplement rules with the DSHEA disclaimer. A client with a diagnosed condition or on prescription medication is sent back to their provider before any plant is discussed. Confirm your state's rules with the state board; they differ and change.
That is why the safety field is never blank and why the honest-line column above reads as it does. Our course notes call hawthorn the plant of the heart and emotions; the entry a U.S. student writes adds that a client with a heart condition is referred out. Both sentences belong in the monograph, and the American Herbalists Guild code of ethics says the same at length.
What does energetics mean, and is it evidence?
Energetics is the traditional classification of plants and people by qualities: warming or cooling, drying or moistening, tonifying or relaxing, plus taste. Ginger is warming and drying; chamomile is cooling and relaxing; a person who runs hot and tense is matched with cooling, relaxing plants. It is a sorting system with roots in Greek, Chinese and Ayurvedic tradition, and herbalists find it useful for choosing between plants with similar actions.
It is not evidence. Nothing in a laboratory measures warming, and no trial has tested whether matching energetics to a person changes anything. We record it in the fourth field of every monograph, labelled as tradition, because a student who cannot speak the vocabulary cannot read the old herbals, and one who mistakes it for pharmacology will overpromise. Constituents and safety, the two adjacent fields, are where the evidence sits.
How many herbs does a practitioner actually need?
Fewer than the binder suggests. Most working herbalists use 20 to 30 plants for 90 percent of consultations and know another 50 to 70 well enough to recognise, source and prepare. That is the shape of our repertoire: 80 to 100 monographs, with the first 12 above worked hardest because they teach every preparation, every safety category and every kind of honest line.
If you want to write yours with plants in your hands and a teacher watching live, our live online herbal and phytotherapy program runs 6 teaching days in live sessions (42 teaching hours) for $2,000, with a monograph repertoire of 80 to 100 herbs built entry by entry. What those entries are worth once you are working is the subject of our note on what herbalists actually earn. Start with chamomile. Steep it covered, and write down what you taste.
Questions on this topic.
What is the difference between a materia medica and an herbal?+
An herbal is a book about plants written for readers, often with lore, history and illustrations. A materia medica is a structured reference of monographs, one per plant, with the same fields in the same order so entries can be compared: botanical name, part used, actions, energetics, constituents, preparations, dose, safety and sources. Working herbalists keep a personal materia medica in their own words; an herbal is something they read to write it.
How many herbs should a beginner herbalist learn?+
Twelve well, before anything else. Chamomile, peppermint, nettle, lemon balm, hawthorn, thyme, ginger, echinacea, calendula, dandelion, elder and plantain cover every common preparation and every safety category a student needs to understand. Most programs then build to 40 in the first year and 80 to 100 by certification. Working herbalists use 20 to 30 plants for most consultations, so depth on a few matters more than breadth on many.
What is a monograph in herbalism?+
A single structured entry describing one plant: its Latin name and family, the part used, its traditional actions, energetics, main constituents, preparations and usual doses, safety and interactions, and the sources the entry draws on. Formal monographs are published by bodies such as the German Commission E; a student's monographs are written by hand from reading, tasting, preparing and using the plant, and revised as experience accumulates.
Can herbalists legally recommend herbs in the United States?+
Yes, within limits. No state licenses herbalists, but practising medicine without a licence is illegal everywhere, and the boundary is the claim. An herbalist may describe how a plant traditionally supports normal function and may prepare and sell products labelled under DSHEA supplement rules. An herbalist may not diagnose, claim to treat a disease or advise a client to change a medication. Clients with diagnosed conditions are referred to their provider.
What does DSHEA mean for herbalists?+
The Dietary Supplement Health and Education Act of 1994 classifies herbal products as supplements, not drugs. A product may carry a structure-or-function statement such as supports digestion, with the disclaimer that the FDA has not evaluated it and that it is not intended to diagnose, treat, cure or prevent disease. Any disease claim makes it an unapproved drug. Products sold to the public must also follow FDA manufacturing and labelling rules.
What are herbal energetics?+
A traditional classification of plants and people by qualities: warming or cooling, drying or moistening, tonifying or relaxing, plus taste. Ginger is warming and drying, chamomile cooling and relaxing. Herbalists use it to choose between plants with similar actions and to read older texts. It is recorded in a monograph as tradition, not evidence: no laboratory measure corresponds to warming, and no trial has tested whether matching energetics to a person changes outcomes.
Which herbs are unsafe for beginners to use?+
Anything with a narrow margin between useful and toxic dose, and anything easily confused with a poisonous look-alike. Beginners avoid comfrey internally, pennyroyal, wormwood in quantity, lobelia, and raw elder berries, leaves and stems, which must be cooked. Water hemlock is confused with edible relatives every year. Licorice raises blood pressure, as our course notes warn. Any plant for a client on prescription medication waits until interactions are checked.
How long does it take to build a materia medica?+
About a year for a working foundation, at one plant a week: identify it, taste it, prepare it two ways, read three references, write the entry, revise it after use. That produces 40 to 50 entries a student actually knows. Programs that ask for 80 to 100 monographs spread them over 12 months or more for the same reason. A materia medica written in a weekend is a set of summaries; one written over a year is a reference.
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About the author
Valérie Fabre · Founder & Director, Harmonika Institute
Valérie Fabre founded Harmonika Institute in 2025, after a decade seeing clients in private kinesiology practice and, before that, thirteen years in international trade. A French-born polyglot who now splits her time between Dallas and Miami, she sets the school's curriculum and editorial standards and champions ethical, in-person training.
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