Marsh spurge Toxic?

Updated 2026-03-06| 5 min read| 3,279 found this helpful
Euphorbia palustris L.
1

All plant parts containing milky sap are toxic, and active terpene compounds do not degrade during storage or drying.

2

Exposure causes severe gastrointestinal distress, neurological abnormalities, heart rhythm disorders, and eye inflammation; toxins can be excreted in cow milk, making it unsafe for consumption.

3

The plant has a sharp, unpleasant odor that reduces accidental ingestion risk, but dried plant material in forage remains dangerous for livestock.

FAQ

Is Marsh spurge toxic to Humans?

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

Is Marsh spurge toxic to Cats?

Expected symptoms include oral mucosa irritation, excessive salivation, vomiting, bloody diarrhea, abdominal pain, lethargy, and potential organ damage with large ingestions; eye contact causes severe eye inflammation (High)

Is Marsh spurge toxic to Dogs?

Expected symptoms include oral mucosa irritation, excessive salivation, vomiting, bloody diarrhea, abdominal pain, lethargy, and potential organ damage with large ingestions; eye contact causes severe eye inflammation (High)

Is Marsh spurge toxic to Horses?

Expected symptoms include oral mucosa irritation, excessive salivation, colic, bloody diarrhea, uncoordinated movement, and potential organ damage with large ingestions; eye contact causes severe eye inflammation (High)

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Toxicity Details

Humans
High

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

Cats
High

Expected symptoms include oral mucosa irritation, excessive salivation, vomiting, bloody diarrhea, abdominal pain, lethargy, and potential organ damage with large ingestions; eye contact causes severe eye inflammation

Dogs
High

Expected symptoms include oral mucosa irritation, excessive salivation, vomiting, bloody diarrhea, abdominal pain, lethargy, and potential organ damage with large ingestions; eye contact causes severe eye inflammation

Horses
High

Expected symptoms include oral mucosa irritation, excessive salivation, colic, bloody diarrhea, uncoordinated movement, and potential organ damage with large ingestions; eye contact causes severe eye inflammation

Toxicity Snapshot

Toxic PartsAll plant parts that contain milky sap
Exposure RouteIngestion of fresh or dried plant material, dermal contact with milky sap, eye contact with sap, consumption of contaminated milk from exposed cows
Toxic CompoundsIngenol esters; Phorbol esters; Euphol

First Aid & Prevention

First 30 Minutes

  • • If ingested, rinse mouth thoroughly with clean water; do not induce vomiting unless instructed by a medical professional or veterinarian
  • • If sap contacts skin, wash affected area immediately with soap and cold water for at least 10 minutes
  • • If sap contacts eyes, flush continuously with lukewarm clean water for 15+ minutes, lifting upper and lower eyelids regularly
  • • Remove all remaining plant material from the mouth, skin, or fur of exposed pets or livestock immediately

Contact Vet Immediately

  • • Any confirmed or suspected ingestion of the plant by humans, companion animals, or livestock
  • • Onset of symptoms including vomiting, bloody diarrhea, difficulty breathing, seizures, or severe eye pain after exposure
  • • Development of abnormal urine color, irregular heart rate, or uncoordinated movement post-exposure

Prevention

  • • Avoid planting Marsh spurge in areas accessible to children, pets, or grazing livestock
  • • Wear protective gloves and eye goggles when handling any Euphorbia species to prevent sap contact
  • • Inspect hay and dried forage for Euphorbia species before feeding to livestock, as toxins remain active after drying

Treatment & Prognosis

  • • Perform decontamination: administer activated charcoal for recent ingestions, gastric lavage only under professional supervision for severe cases
  • • Provide supportive symptomatic care: fluid therapy to prevent dehydration from vomiting/diarrhea, antiarrhythmics for heart rhythm abnormalities, pain management for colic
  • • Treat eye exposure with prescribed topical anti-inflammatories and antibiotics to prevent secondary infection and permanent eye damage
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Professional Toxicology

Scientific NameEuphorbia palustris L.
AliasesMarsh euphorbia、Sumpf-Wolfsmilch、Euphorbe des marais、Euforbia lattaiola
Toxicity Grade
HumansHigh
CatsHigh
DogsHigh
HorsesHigh
Target Organs
Gastrointestinal tractKidneysHeartEyesNervous systemOral mucosa
Mechanism of Action

• Irritant terpene compounds cause immediate mucosal and tissue irritation upon contact or ingestion

• Toxins disrupt cellular function, leading to gastrointestinal damage, organ injury, and impairment of cardiac and nervous system function

• Toxic compounds are not degraded by drying or long-term storage, so dried plant material remains fully toxic

Other Species Risk (CliniTox)

Information from CliniTox veterinary text.

Cattle: Ingestion of fresh or dried plant material causes colic, vomiting, bloody diarrhea, bloody urine, muscle tremors, and uncoordinated movement; toxins are excreted in milk, which may turn reddish or have an altered taste and is unsafe for consumption
Sheep: Ingestion of fresh plants causes severe swelling and inflammation of the oral mucosa, excessive salivation, and diarrhea; full recovery is expected after moving to an unaffected pasture
Birds: Extremely toxic, ingestion may cause rapid onset of severe symptoms and death
Confusion Risk

The following plants look similar and may be confused:

Sun spurge Euphorbia helioscopia
Visually similar due to shared Euphorbia family traits including milky sap and clustered flower structures; key difference is Marsh spurge grows primarily in wet marsh habitats, while sun spurge is common in dry agricultural/disturbed soils
Cypress spurge Euphorbia cyparissias
Has similar milky sap and small clustered inflorescences; distinguished by Marsh spurge's broad oval leaves and wet habitat preference, compared to cypress spurge's narrow needle-like leaves and dry habitat preference
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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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