Herbarium of the Ancients — Detailed Notebook

Frangula purshiana

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: Never use fresh bark: it must be dried and aged for at least one year, otherwise severe digestive irritation and violent vomiting may occur. Use is not recommended during pregnancy, breastfeeding, in children, or in cases of inflammatory intestinal disorders (colitis, appendicitis, obstruction). Prolonged use beyond a few days may lead to bowel dependence and abnormal potassium loss. Consult a healthcare professional before any use, especially when taking medications (diuretics, anti-arrhythmics, cardiac glycosides).

Decoction — Dried and aged bark (minimum 1 year)

Cascara bark decoction

A small amount of bark is gently boiled in water for a few minutes, then left to infuse. This preparation was traditionally reserved for brief and occasional use, never daily over an extended period. Dosage must be validated with a healthcare professional or recognized pharmacopoeia before use.

Tincture — Dried and aged bark

Bark tincture

The bark was macerated in alcohol for several weeks to obtain a concentrated tincture, traditionally used in very small doses. Professional advice is essential before any use due to the potency of this form. Dosage must be validated with a healthcare professional or recognized pharmacopoeia before use.

Powder — Dried and aged bark

Powdered bark in capsules

The bark ground into fine powder was sometimes encapsulated to facilitate intake and mask its pronounced bitterness. Consultation with a healthcare professional is recommended before use. Dosage must be validated with a healthcare professional or recognized pharmacopoeia before use.

Where to find it

Sourcing the plant

It can still be found in the wild in the moist forests of the Pacific Northwest, as well as in dried bark form from specialized herbalists.

Harvest season

When to harvest it

The bark is traditionally harvested in spring or autumn, then must be dried and aged for at least one year before any use.

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