Herbarium of the Ancients — Detailed RecordFR · EN
Cow Parsnip
Heracleum maximum
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: Beware of possible confusion with toxic umbellifers (poison hemlock, giant hogweed): positive identification by an expert is essential before any harvesting. The sap of cow parsnip can cause photosensitization of the skin (burns, blistering) if contact is followed by sun exposure; handle with gloves. Internal use is not recommended without advice from a healthcare professional, especially in pregnant or breastfeeding women, children, and in cases of ongoing medication. Do not exceed occasional and traditional use; avoid prolonged self-medication.
Decoction — Root
Decoction of dried root
The root, cut into pieces, is gently boiled for about fifteen minutes in water, then filtered. This preparation was used for moderate internal use or as steam inhalation. Dosage must be validated with a healthcare professional or recognized pharmacopoeia before use.
Poultice — Root
Poultice of crushed root
The fresh or rehydrated root is crushed to obtain a paste, then applied directly to the affected area and held in place with a cloth. Reserved for occasional external use. Dosage must be validated with a healthcare professional or recognized pharmacopoeia before use.
Light infusion — Flowers
Light preparation from flowers
Dried flowers can be briefly infused in simmering water, according to poorly documented traditional uses and reserved for cautious external use. Dosage must be validated with a healthcare professional or recognized pharmacopoeia before use.
Where to find it
Obtaining the plant
It is found wild in moist forest edges, ditches, and riverbanks of North America; it is rarely cultivated or sold in herbalist shops due to risks of confusion with other umbellifers.
Harvesting season
When to harvest it
Flowers are picked in summer during flowering, while the root is harvested in autumn, after the aerial parts have withered.
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