Herbarium of the Ancients — Detailed MonographFR · EN
devil's club
Oplopanax horridus
Please read before use: the information below describes traditional and informational uses — it does not replace the advice of a healthcare professional. In case of doubt, pregnancy, breastfeeding, ongoing treatment, or use in children, seek advice before use.
Enhanced precautions for this plant: Fresh bark and spines are irritating to skin and mucous membranes; handling requires gloves and great care. This plant is not recommended for pregnant or breastfeeding women, due to insufficient data on its safety. Prolonged or high-dose internal use is not documented as safe: the advice of a healthcare professional or experienced herbalist is essential before any intake. Interactions with ongoing medication have not been thoroughly studied; caution is advised in cases of chronic illness.
Decoction — Inner bark of stems and roots
Traditional bark decoction
The inner bark, stripped of its spines, is scraped and then gently boiled in water for about twenty minutes. This preparation, traditionally used in small quantities, must be made under the guidance of an experienced person due to the lack of precise data on safe doses. Dosage must be validated with a healthcare professional or recognized pharmacopoeia before use.
Poultice — Fresh or dried inner bark, rehydrated
Bark poultice for external use
The bark is pounded or softened by moist heat, then applied directly to the affected area using a clean cloth. This external application was traditionally renewed once or twice daily, while monitoring for any skin reaction. Dosage must be validated with a healthcare professional or recognized pharmacopoeia before use.
Where to find it
Sourcing the plant
Devil's club grows naturally in humid, shaded understories of Pacific Northwest coastal forests, from southern Alaska to Oregon. It is rarely cultivated and is mainly found through herbalist shops specializing in North American plants.
Harvest season
When to harvest it
The bark is traditionally harvested in spring or early summer, when sap flows abundantly, taking care to collect only a limited portion from each plant to preserve its survival.
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