Western herbalism

Galen's system ran European medicine for fifteen hundred years, was demolished in the nineteenth century, and the practice that survived had to rebuild its theory from scratch.

What it is

The European tradition of medicinal plant use — from the Greek physicians through the medieval monastery garden and the early modern herbal, to the professional practice of medical herbalism that exists today.

It is the tradition with the sharpest discontinuity in its history. Chinese and Ayurvedic herbalism have been practised more or less continuously within their own theoretical frameworks. Western herbalism had its framework taken away.

Where it came from

Greek and Roman foundations. Theophrastus catalogued plants in the fourth century BCE. Dioscorides compiled De Materia Medica around 65 CE, and it remained the standard reference for fifteen centuries. Galen (129–216 CE) supplied the theory: the four humours, the four qualities, and a scheme for grading every plant by degree of heat and moisture. Galenic medicine was the intellectual system, and "galenical" is still a pharmacy word for a plant-derived preparation.

Monastic transmission. Through the early medieval period the texts were held and copied in monasteries, and the herbularius — the physic garden — was a standard feature. The Benedictine Rule's obligation to care for the sick made this an institutional duty rather than a hobby. Hildegard of Bingen wrote from inside that world.

Islamic synthesis and return. Between the ninth and twelfth centuries, physicians working in Arabic — above all Ibn Sīnā, whose Canon of Medicine is described under Unani — preserved the Greek material, added Indian and Persian plants, and systematised the pharmacology. It came back into Europe through translation at Toledo and Salerno, and the Canon was a European medical textbook into the seventeenth century.

The printed herbal. Printing turned a manuscript tradition into a mass one: Brunfels, Fuchs, Gerard's Herball (1597) and then Culpeper, who translated the physicians' Latin pharmacopoeia into English specifically so ordinary people would not have to pay a physician — a genuinely radical act for which he was attacked at the time.

Paracelsus (1493–1541) attacked Galen head-on, insisted on chemical preparation and specific remedies for specific diseases, and is the hinge between herbalism and pharmacology. He is covered under Western esotericism, because he was doing both at once.

And then the theory collapsed. Nineteenth-century physiology, germ theory and chemistry dismantled humoral medicine completely. Alkaloids were isolated, doses became measurable, and the plant became a raw material rather than a remedy. In Britain the tradition survived largely through the National Association of Medical Herbalists, founded in 1864, which is why professional medical herbalism there has an unbroken institutional line while the theory underneath it does not.

How it is practised

Modern medical herbalists in the UK, Australia and New Zealand typically train for three or four years, take a case history, and prescribe individualised mixtures of tinctures. Practice is not statutorily regulated in most places, though professional associations set standards.

The theoretical vocabulary in current use — alterative, adaptogen, nervine, demulcent, bitter — is mostly nineteenth and twentieth century, not Galenic. Adaptogen was coined by a Soviet pharmacologist, Nikolai Lazarev, in 1947. Nothing here instructs.

What we can and cannot say

We can say the framework problem is genuine and is the tradition's central difficulty. Chinese and Ayurvedic herbalism prescribe within theories that are internally coherent and still taught. Western herbalism's own theory was refuted, and what replaced it is a mixture of borrowed pharmacology, borrowed energetics from other traditions, and terms coined in the last century and a half. Practitioners are aware of this and it is argued about seriously within the field.

We can say the practice has real content anyway. A long consultation, an individualised prescription and continuity of care are worth something regardless of the theory attached, and several of the plants in common use have evidence behind them — set out under the evidence.

We can say the history is not as continuous as it is often presented. A great deal of what is sold as ancient Western herbal wisdom is Victorian or later, and some of it — Bach's flower essences in particular — is not herbalism at all in the pharmacological sense.

And we can say the professional bodies deserve credit on one specific point. The trained medical herbalist associations require pharmacology and drug-interaction training and instruct members to communicate with a patient's doctor. That is a meaningful distinction from the unregulated end of the supplement market, and it is the reason the risks described under interactions concentrate in retail rather than in clinical herbal practice.

We cannot say the tradition has recovered a theory. What can be said is that it is the one system here that had to keep practising after its explanation was taken away, and that it has been honest about the gap more often than not.

What it is

Where it came from

How it is practised

What we can and cannot say

Further reading