Common groundsel Toxic?

Updated 2026-03-06| 3 min read| 3,615 found this helpful
Common groundsel
1

Pyrrolizidine alkaloid toxins are heat-stable, remaining active in dried hay, silage, and even after cooking.

2

No curative treatment exists for poisoning, and ingestion often leads to fatal outcomes in sensitive species.

3

Pigs, chickens, cattle, and horses are the most sensitive species to its toxic effects.

FAQ

Is Common groundsel toxic to Humans?

No human toxicity data is available; avoid ingestion as a precaution to prevent potential liver damage. (Unknown)

Is Common groundsel toxic to Cats?

No specific feline toxicity data is available; restrict access to avoid accidental ingestion. (Unknown)

Is Common groundsel toxic to Dogs?

No specific canine toxicity data is available; restrict access to avoid accidental ingestion. (Unknown)

Is Common groundsel toxic to Horses?

Causes progressive seneciosis (Schweinsberger disease); symptoms appear 3 days to 6 months after ingestion, with terminal stages usually fatal within days. (Severe)

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Toxicity Details

Humans
Unknown

No human toxicity data is available; avoid ingestion as a precaution to prevent potential liver damage.

Cats
Unknown

No specific feline toxicity data is available; restrict access to avoid accidental ingestion.

Dogs
Unknown

No specific canine toxicity data is available; restrict access to avoid accidental ingestion.

Horses
Severe

Causes progressive seneciosis (Schweinsberger disease); symptoms appear 3 days to 6 months after ingestion, with terminal stages usually fatal within days.

Toxicity Snapshot

Toxic PartsWhole plant; flowers have the highest alkaloid concentrations, young plants are the most toxic. Toxins remain active in dried hay and silage.
Exposure RouteIngestion of fresh plant material, or contaminated hay, silage, and animal feed.
Toxic CompoundsJacobine; Jaconine; Jacodine; Senecionine; Retrorsine; Seneciphylline; Senkirkine; Oxalates

First Aid & Prevention

First 30 Minutes

  • • Immediately stop feeding any hay, silage, or feed suspected to be contaminated with common groundsel.
  • • Isolate affected animals from all sources of the plant to prevent further exposure.
  • • Contact a veterinarian immediately for supportive care guidance.

Contact Vet Immediately

  • • Any suspected ingestion of common groundsel by pets or livestock.
  • • Unexplained lethargy, weight loss, or liver dysfunction in animals with access to the plant.
  • • Confirmed presence of common groundsel in pasture or animal feed supplies.

Prevention

  • • Regularly inspect pastures, hay, and silage for common groundsel and remove all found plants.
  • • Avoid harvesting animal feed from areas with known Senecio species infestations.
  • • Restrict pet and livestock access to areas where common groundsel grows.

Treatment & Prognosis

  • • No curative treatment exists for pyrrolizidine alkaloid poisoning from this plant.
  • • Veterinarians may provide supportive care to reduce liver damage and ease clinical symptoms.
  • • Long-term liver function monitoring is recommended for animals that have ingested the plant.
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Professional Toxicology

Scientific NameSenecio vulgaris L.
Aliases
Toxicity Grade
HumansUnknown
CatsUnknown
DogsUnknown
HorsesSevere
Target Organs
LiverGastrointestinal tract
Mechanism of Action

• Pyrrolizidine alkaloids are metabolized in the liver into reactive toxic intermediates that cause irreversible liver cell damage.

• Toxins accumulate with repeated low-dose exposure, leading to chronic progressive disease over time.

Other Species Risk (CliniTox)

Information from CliniTox veterinary text.

Pig: Most sensitive species, toxicity index = 1, ingestion often leads to fatal poisoning.
Chicken: Very high sensitivity, toxicity index = 5, classified as severely toxic.
Cattle: High sensitivity, toxicity index = 14, ingestion causes chronic progressive seneciosis.
Rat: Moderate sensitivity, toxicity index = 50.
Mouse: Low sensitivity, toxicity index = 150.
Sheep and Goat: Lowest sensitivity among listed species, toxicity index = 200.
Wild and domestic birds: Classified as very severely toxic (+++ per CliniTox grading).
Confusion Risk

The following plants look similar and may be confused:

Other Senecio species Senecio spp.
Visually similar in foliage and flower structure; most other Senecio species also contain toxic pyrrolizidine alkaloids.
St. John's wort Hypericum spp.
Similar yellow flower and leaf shape; St. John's wort is also toxic and causes photosensitivity reactions.
Rough hawksbeard Crepis biennis
Similar rosette and yellow composite flower structure; Crepis biennis is non-toxic.
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Related Toxic Plants

Common ragwort
Common ragwort
Jacobaea vulgaris
Severe
Bitter sneezeweed
Helenium amarum
Moderate to High
Common cocklebur
Common cocklebur
Xanthium strumarium
High to Severe

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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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