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Toxic☠️ To avoid💊 Medicinal

🫐 Purging Buckthorn

Rhamnus cathartica · Rhamnacées

🌳 Temperate Europe
🧠 To remember it« Buckthorn: its Latin name says it all, cathartica like catharsis-purge » — a black berry in a spiny hedge whose scientific name alone warns you of severe digestive danger.
Purging Buckthorn — Rhamnus cathartica

🔍 Identify it without mistakes

Spiny shrub of hedges and forest edges, recognizable by its twigs often ending in a spine and its small, highly toxic black berries clustered in small groups in the leaf axils. Its very name ("cathartica", purging) is a warning: historically used as a drastic purgative, it was abandoned in medicine due to its violent nature, and must never be consumed today.

  1. twigs often ending in a short, rigid spine
  2. leaves opposite or sub-opposite, oval, finely serrated, with clearly visible arched veins
  3. small, glossy black berries, clustered in groups of 2-4 in the leaf axils, highly toxic
  4. yellow-orange wood under the gray bark, visible when cut
  5. dioecious shrub (separate male and female plants), only female plants bear berries
Size2-6 m (shrub or small tree)
Floweringmai-juin
Habitathedges, calcareous woodland edges, overgrown wasteland, thickets

⚠️ Not to be confused with

Bilberry, blueberry, or other small edible black berries (Vaccinium sp.)forte — buckthorn berries cause violent vomiting and severe diarrhea, especially dangerous in children

To tell them apart: buckthorn is a woody shrub with spiny twigs and berries clustered in the leaf axils, never a low-growing plant like the bilberry; if you have any doubt about an unknown black berry in a hedge, refrain from eating it

Wild lowbush blueberry (Vaccinium angustifolium)aucun — the edible berry is this one; the risk is the opposite: mistaking purging buckthorn for a blueberry

To tell them apart: the blueberry is a low, carpet-forming subshrub (under 40 cm) with each berry bearing a small five-pointed starry crown; buckthorn is a tall shrub with crownless berries, often featuring a twig ending in a spine

💊 Healing with it

historically used as a powerful purgative (bark and berries contain laxative anthraquinone glycosides), a use now abandoned in favor of better-dosed and safer laxatives

Level of evidence : traditional use — Toxiplante — Rhamnus cathartica

⚠️ TOXIC: never consume the berries or bark without strict medical supervision — overdose easily causes violent abdominal cramps, severe vomiting, and severe diarrhea that can lead to dangerous dehydration, especially in children

🪓 Other bushcraft uses

  • bark and berries traditionally used in dyeing to obtain yellow (unripe berries) or green (ripe berries with alum), dyes known as "bladder green" or "Avignon berry yellow"
Sources (2)

No entry replaces a certain identification in the field, or medical advice. When in doubt: don't eat it. If ingestion is suspected: poison control or 112/911.