Herbarium of the Ancients — Detailed RecordFR · EN
Ageratina altissima
Ageratina altissima
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: Toxic plant containing tremetol, historically responsible for serious poisoning ("milk sickness") in humans and animals. Must under no circumstances be ingested in any form whatsoever, nor consumed via milk or meat from animals that have grazed nearby. No internal use can be recommended; any use, even external, must be subject to the advice of a qualified healthcare professional. Strictly contraindicated for pregnant or breastfeeding women, children, and anyone without certain botanical knowledge of this plant's identification.
No preparation recommended — All plant parts
No safe traditional preparation
Due to its proven toxicity and the risk of tremetol accumulation in the body, no preparation of this plant, whether internal or external, can be described or recommended in this herbarium. Its interest remains primarily historical and botanical. Dosage must be validated with a healthcare professional or recognized pharmacopoeia before use.
Where to find it
Sourcing the plant
This plant can be observed in the wild in open forests and moist edges of eastern United States and Canada; it is neither cultivated nor sold in herbalist shops due to its recognized toxicity.
Harvest season
When to harvest it
It flowers from late summer to autumn, a period when its toxicity to livestock was traditionally considered most concerning.
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