Green hellebore Toxic?

Updated 2026-03-06| 5 min read| 2,850 found this helpful

All parts of green hellebore are severely toxic to humans and common domestic animals including cats, dogs, and horses

Toxic compounds remain fully active after drying and long-term storage, so dried plant material is equally dangerous

Ingestion can cause life-threatening cardiac arrhythmia, neurological paralysis, and sudden cardiac arrest even in small doses

FAQ

Is Green hellebore toxic to Humans?

Salivation, vomiting, diarrhea, colic, dilated pupils, central nervous system excitation, paralysis, digitalis-like heart effects (bradycardia, arrhythmia), potential cardiac arrest (Severe)

Is Green hellebore toxic to Cats?

Expected symptoms match human presentations, including gastrointestinal distress, abnormal heart rhythm, neurological impairment, and risk of fatal cardiac arrest (Severe)

Is Green hellebore toxic to Dogs?

Expected symptoms match human presentations, including gastrointestinal distress, abnormal heart rhythm, neurological impairment, and risk of fatal cardiac arrest (Severe)

Is Green hellebore toxic to Horses?

Expected symptoms match human presentations, including gastrointestinal distress, abnormal heart rhythm, neurological impairment, and risk of fatal cardiac arrest (Severe)

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Toxicity Details

Humans

Severe

Salivation, vomiting, diarrhea, colic, dilated pupils, central nervous system excitation, paralysis, digitalis-like heart effects (bradycardia, arrhythmia), potential cardiac arrest

Cats

Severe

Expected symptoms match human presentations, including gastrointestinal distress, abnormal heart rhythm, neurological impairment, and risk of fatal cardiac arrest

Dogs

Severe

Expected symptoms match human presentations, including gastrointestinal distress, abnormal heart rhythm, neurological impairment, and risk of fatal cardiac arrest

Horses

Severe

Expected symptoms match human presentations, including gastrointestinal distress, abnormal heart rhythm, neurological impairment, and risk of fatal cardiac arrest

Toxicity Snapshot

Toxic PartsAll parts of the plant

Exposure RoutePrimary exposure route is ingestion; skin contact with sap may cause mild localized irritation

Toxic CompoundsHelleborin (saponin mixture); Ranunculoside (protoanemonin); Hellebrin (bufadienolide-type cardiac glycoside)

First Aid & Prevention

First 30 Minutes

• If ingested, immediately induce vomiting only if the subject is conscious and not experiencing seizures
• Administer activated charcoal as soon as possible to absorb unprocessed toxic compounds
• Rinse the mouth thoroughly with clean water to remove residual plant material

Contact Vet Immediately

• Any confirmed ingestion of even small amounts of green hellebore material
• Onset of any symptoms including excessive salivation, vomiting, or irregular heart rate
• Observation of seizures, paralysis, or signs of acute cardiac distress

Prevention

• Avoid planting green hellebore in areas accessible to children, pets, or grazing livestock
• Never consume any part of the plant, even after cooking, drying, or processing
• Wear protective gloves when handling the plant to avoid skin contact with toxic sap

Treatment & Prognosis

• Perform gastrointestinal decontamination via emesis, activated charcoal administration, or gastric lavage as clinically appropriate
• Provide symptomatic care including anti-emetics for vomiting and fluid therapy to correct electrolyte imbalances
• Closely monitor cardiac function and administer anti-arrhythmic medications to address digitalis-like heart effects

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Professional Toxicology

Scientific NameHelleborus viridis L.

AliasesGrüne Nieswurz (German)、Héllebore vert (French)、Elleboro verde (Italian)

Toxicity Grade

HumansSevere

CatsSevere

DogsSevere

HorsesSevere

Target Organs

Gastrointestinal tractCardiac systemCentral nervous systemOcular tissue

Mechanism of Action

• Cardiac glycoside hellebrin disrupts sodium-potassium ATPase pumps in cardiac cells, causing abnormal heart rhythm and potential arrest

• Protoanemonin irritates mucosal membranes, triggering severe gastrointestinal distress including vomiting, diarrhea, and colic

• Neurotoxic compounds cause initial central nervous system excitation followed by progressive, potentially fatal paralysis

Other Species Risk (CliniTox)

Information from CliniTox veterinary text.

Cattle: Severe toxicity risk, with potential for fatal cardiac arrest after grazing on fresh or dried plant material

Sheep: High sensitivity to toxins, with common symptoms including acute gastrointestinal distress and neurological impairment

Confusion Risk

The following plants look similar and may be confused:

Other Hellebore species Helleborus spp.

All Helleborus species are visually similar and share comparable toxic profiles, making them easy to confuse with green hellebore; no Helleborus varieties are safe for consumption

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Data Sources

1. CliniTox (Universität Zürich)

This information is for reference only and does not constitute medical advice. If ingestion or poisoning is suspected, seek medical or veterinary attention immediately.