Snow-on-the-mountain spurge Toxic?

Updated 2026-03-06| 2 min read| 3,572 found this helpful
Snow-on-the-mountain spurge
1

All plant parts containing milky sap are toxic, with active compounds that are not degraded by storage or drying

2

Ingestion causes severe gastrointestinal, cardiovascular and neurological symptoms, while eye contact triggers serious corneal and conjunctival inflammation

3

Toxins are excreted in the milk of exposed cows, making milk from affected animals unsafe for consumption

FAQ

Is Snow-on-the-mountain spurge toxic to Humans?

Bloody diarrhea, vomiting, colic, dizziness, seizures, circulatory collapse, irregular heartbeat, bloody urine; eye contact causes severe conjunctivitis and corneal inflammation (High)

Is Snow-on-the-mountain spurge toxic to Cats?

No species-specific data available; expected to cause oral/gastrointestinal irritation, skin/eye inflammation from sap contact, and systemic effects at high ingestion doses (Moderate)

Is Snow-on-the-mountain spurge toxic to Dogs?

No species-specific data available; expected to cause oral/gastrointestinal irritation, skin/eye inflammation from sap contact, and systemic effects at high ingestion doses (Moderate)

Is Snow-on-the-mountain spurge toxic to Horses?

No species-specific data available; expected to cause oral/gastrointestinal irritation, skin/eye inflammation from sap contact, and systemic effects at high ingestion doses (Moderate)

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Toxicity Details

Humans
High

Bloody diarrhea, vomiting, colic, dizziness, seizures, circulatory collapse, irregular heartbeat, bloody urine; eye contact causes severe conjunctivitis and corneal inflammation

Cats
Moderate

No species-specific data available; expected to cause oral/gastrointestinal irritation, skin/eye inflammation from sap contact, and systemic effects at high ingestion doses

Dogs
Moderate

No species-specific data available; expected to cause oral/gastrointestinal irritation, skin/eye inflammation from sap contact, and systemic effects at high ingestion doses

Horses
Moderate

No species-specific data available; expected to cause oral/gastrointestinal irritation, skin/eye inflammation from sap contact, and systemic effects at high ingestion doses

Toxicity Snapshot

Toxic PartsAll plant parts that contain milky sap; the plant is rarely consumed due to its sharp, unpleasant odor
Exposure RouteIngestion of plant material or contaminated cow milk, skin contact with milky sap, eye contact with milky sap
Toxic CompoundsIngenol esters; Phorbol esters; Euphol

First Aid & Prevention

First 30 Minutes

  • • Rinse mouth thoroughly with clean water if ingested; do not induce vomiting unless directed by a medical/vet professional
  • • Wash sap-exposed skin with soap and cold water immediately to reduce irritation
  • • Flush sap-exposed eyes with lukewarm clean water for at least 15 minutes
  • • Remove all remaining plant material from the mouth, skin or fur of exposed people or animals

Contact Vet Immediately

  • • Any confirmed or suspected ingestion of the plant by pets, livestock or children
  • • Presence of symptoms including vomiting, bloody diarrhea, seizures, eye pain or irregular heartbeat after exposure
  • • Confirmed exposure of dairy cattle to the plant, to test for milk contamination

Prevention

  • • Avoid planting this species in areas accessible to children, pets or grazing livestock
  • • Wear protective gloves and goggles when handling the plant to avoid sap contact
  • • Inspect hay and dry livestock feed for contamination, as toxins remain active after drying

Treatment & Prognosis

  • • Perform gastric decontamination (activated charcoal, gastric lavage) for recent ingestion as directed by a professional
  • • Administer symptomatic care: fluid therapy for dehydration, antiarrhythmics for heart irregularities, pain management for colic, and anti-inflammatory care for eye/skin irritation
  • • Monitor cardiac, gastrointestinal and renal function for 24-72 hours post-exposure
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Professional Toxicology

Scientific NameEuphorbia marginata Pursh
AliasesMountain snow、Snow on the mountain、Smoke-on-the-prairie、Variegated spurge
Toxicity Grade
HumansHigh
CatsModerate
DogsModerate
HorsesModerate
Target Organs
Gastrointestinal tractEyesSkinKidneysHeartNervous system
Mechanism of Action

• Irritant terpene compounds cause direct tissue damage to mucosal membranes of the mouth, gastrointestinal tract, eyes and skin

• Systemic absorption of toxins disrupts cardiac rhythm, renal function and neural signaling leading to multi-organ effects

• Terpene toxins remain biologically active after plant drying and long-term storage, making contaminated feed dangerous

Other Species Risk (CliniTox)

Information from CliniTox veterinary text.

Birds: Very highly toxic; ingestion can cause rapid fatal systemic effects
Cattle: Highly toxic; ingestion of fresh or dried plant causes colic, vomiting, bloody diarrhea, bloody urine, muscle tremors and dizziness; toxins are excreted in milk, turning it reddish or altering its taste
Sheep: Ingestion of fresh plant causes severe swelling and inflammation of the oral mucosa, excessive salivation and diarrhea; most animals recover fully after being moved to an uncontaminated pasture
Confusion Risk

The following plants look similar and may be confused:

Crown of thorns Euphorbia milii
Member of the same Euphorbia genus, produces similar irritant milky sap, often confused with other spurge species by casual observers
Cypress spurge Euphorbia cyparissias
Common Euphorbia species with overlapping growth habitats and identical sap toxicity to E. marginata
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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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