Pennyroyal

By tjohnson , 13 June, 2026

Pennyroyal

Scientific Name: Mentha pulegium

Botanical and Historical Origin

Europe and the Middle East. The American species (Hedeoma pulegioides) has a similar strong peppermint-like scent.

Evolution of Historical Use

The Roman name 'Pulegium' relates to fleas (pulex), as the strong scent was used to repel them. Highly controversial in history due to its use in reproductive control.

Traditional Cultivation and Harvesting

Small, low-growing member of the mint family. Prefers moist, partially shaded areas. Harvest in late summer.

Historical Medicinal Profile

Historical Internal Use

historical abortifacient, emmenagogue

Historical External Use

flea and tick repellant

Safety and Modern Toxicology

Essential oil is highly toxic, causes liver failure and death. Historical use only.

Circular Codex References

This ingredient is also documented in our livestock-focused Plant Codex, where you can find detailed information on its identification, veterinary safety, and farmstead management.

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