Sheep laurel Toxic?

Updated 2026-03-06| 3 min read| 3,195 found this helpful
Kalmia angustifolia L. (syn. Kalmia intermedia Lange)
1

All parts of the plant are toxic, containing potent grayanotoxins that disrupt nervous and cardiovascular system function.

2

Poisoning symptoms onset within 6 hours in cattle, with high risk of fatal aspiration pneumonia and organ failure without prompt treatment.

3

The plant has Severe toxicity for birds, and is highly toxic to all mammals including humans, pets and livestock.

FAQ

Is Sheep laurel toxic to Humans?

No dedicated human clinical data is available; expected symptoms align with grayanotoxin poisoning: apathy, respiratory depression, excessive salivation, nausea, severe vomiting, abdominal pain, cardiac arrhythmia, seizures, coma, and potentially fatal organ failure if untreated. (High)

Is Sheep laurel toxic to Cats?

No species-specific clinical data is available; expected symptoms include salivation, vomiting, abdominal pain, irregular heart rate, weakness, seizures, and collapse in severe cases. (High)

Is Sheep laurel toxic to Dogs?

No species-specific clinical data is available; expected symptoms include salivation, vomiting, diarrhea, abdominal pain, irregular heart rate, weakness, seizures, and collapse in severe cases. (High)

Is Sheep laurel toxic to Horses?

No species-specific clinical data is available; expected symptoms include excessive salivation, colic, vomiting, irregular heart rate, respiratory distress, weakness, seizures and sudden death in severe cases. (High)

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Toxicity Details

Humans
High

No dedicated human clinical data is available; expected symptoms align with grayanotoxin poisoning: apathy, respiratory depression, excessive salivation, nausea, severe vomiting, abdominal pain, cardiac arrhythmia, seizures, coma, and potentially fatal organ failure if untreated.

Cats
High

No species-specific clinical data is available; expected symptoms include salivation, vomiting, abdominal pain, irregular heart rate, weakness, seizures, and collapse in severe cases.

Dogs
High

No species-specific clinical data is available; expected symptoms include salivation, vomiting, diarrhea, abdominal pain, irregular heart rate, weakness, seizures, and collapse in severe cases.

Horses
High

No species-specific clinical data is available; expected symptoms include excessive salivation, colic, vomiting, irregular heart rate, respiratory distress, weakness, seizures and sudden death in severe cases.

Toxicity Snapshot

Toxic PartsEntire plant
Exposure RouteIngestion of any plant part, accidental consumption of contaminated forage by livestock, ingestion of plant material by curious pets or young children
Toxic CompoundsGrayanotoxin I (Acetylandromedol, Andromedotoxin, Rhodotoxin); Grayanotoxin III (Andromedol); Grayanotoxin II (Andromedenol); Grayanotoxins IV to XXI; Rhodojaponins; Grayanoside A; Pieroside A

First Aid & Prevention

First 30 Minutes

  • • Immediately remove any remaining plant material from the mouth of the exposed person or animal, and isolate them from further access to the plant.
  • • Do not induce vomiting unless explicitly instructed by a medical professional or veterinarian, due to the very high risk of aspiration pneumonia.
  • • Contact a poison control center (for human exposure) or licensed veterinarian (for animal exposure) immediately for next-step guidance.

Contact Vet Immediately

  • • Any confirmed or suspected ingestion of any part of sheep laurel, even in very small amounts.
  • • Onset of potential poisoning symptoms including excessive salivation, vomiting, irregular heartbeat, weakness, seizures or respiratory distress.
  • • Known exposure in companion animals, livestock, or young children that may have consumed plant material.

Prevention

  • • Remove sheep laurel plants from areas accessible to pets, livestock, and young children.
  • • Do not feed cuttings or forage containing sheep laurel to any livestock or companion animals.
  • • Educate foragers, pet owners and livestock handlers to identify sheep laurel and avoid contact with all plant parts.

Treatment & Prognosis

  • • Decontamination via activated charcoal administration if ingestion occurred within 1-2 hours, with appropriate airway protection to prevent aspiration.
  • • Symptomatic support: analgesics for abdominal pain, antibiotics if aspiration pneumonia develops, intravenous infusion of 20% lipid solution at 1.5ml/kg body weight over 5 minutes as clinically indicated.
  • • Atropine administration for symptomatic bradycardia, plus supportive care for cardiac arrhythmias, seizures and respiratory depression as needed.
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Professional Toxicology

Scientific NameKalmia angustifolia L. (syn. Kalmia intermedia Lange)
AliasesLambkill laurel、Narrowleaf kalmia
Toxicity Grade
HumansHigh
CatsHigh
DogsHigh
HorsesHigh
Target Organs
Cardiovascular systemCentral nervous systemRespiratory systemGastrointestinal tract
Mechanism of Action

• Grayanotoxins bind to and prolong the opening of voltage-gated sodium channels in nerve, cardiac and skeletal muscle cells, causing persistent cell depolarization.

• Toxins increase vagal tone, leading to reduced heart rate, low blood pressure, and impaired respiratory function.

• Exposure leads to central nervous system disruption, causing seizures, coma and potentially fatal organ failure in severe cases.

Other Species Risk (CliniTox)

Information from CliniTox veterinary text.

Cattle: Symptoms onset within 6 hours of ingestion, lasting 1-2 days; high risk of fatal aspiration pneumonia, seizures, coma and death without treatment.
Birds: Severe (very high) toxicity, ingestion of even small amounts can lead to rapid fatal poisoning.
Sheep and goats: Highly toxic, as reflected in the plant's common names; ingestion frequently causes fatal poisoning in grazing sheep.
Confusion Risk

The following plants look similar and may be confused:

Other Kalmia species Kalmia spp.
Visually similar to other Kalmia species, all of which are highly toxic; can be distinguished by leaf size and flower color, but all should be treated as toxic.
Catawba rhododendron Rhododendron catawbiense
Member of the same Ericaceae family, has similar evergreen leaves and clustered flowers; all Rhododendron species contain grayanotoxins and are highly toxic.
Japanese pieris Pieris japonica
Member of the same Ericaceae family, has similar leathery evergreen leaves and white/light pink clustered flowers; also contains toxic grayanotoxins.
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Data Sources

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

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