Black locust Toxic?

Updated 2026-03-06| 2 min read| 4,482 found this helpful
Black locust
1

All parts of black locust are toxic, with highest toxin concentrations in bark and seeds

2

Horses are 10 times more sensitive to its toxins than ruminant species like cattle

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Ingestion can lead to life-threatening neurological, cardiac and kidney damage

FAQ

Is Black locust toxic to Humans?

No specific human toxicity data is available. Ingestion may cause gastrointestinal distress, neurological symptoms and organ damage in severe cases. (Moderate)

Is Black locust toxic to Cats?

No specific feline toxicity data reported. Monitor closely and contact a veterinarian immediately if ingestion is suspected. (Low)

Is Black locust toxic to Dogs?

No specific canine toxicity data reported. Monitor closely and contact a veterinarian immediately if ingestion is suspected. (Low)

Is Black locust toxic to Horses?

Colic, reduced intestinal motility, lack of fecal output, pelvic flexure constipation, CNS symptoms (excitation, dilated pupils, blindness, balance disorders, recumbency), heart failure, kidney failure, laminitis (High)

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Toxicity Details

Humans
Moderate

No specific human toxicity data is available. Ingestion may cause gastrointestinal distress, neurological symptoms and organ damage in severe cases.

Cats
Low

No specific feline toxicity data reported. Monitor closely and contact a veterinarian immediately if ingestion is suspected.

Dogs
Low

No specific canine toxicity data reported. Monitor closely and contact a veterinarian immediately if ingestion is suspected.

Horses
High

Colic, reduced intestinal motility, lack of fecal output, pelvic flexure constipation, CNS symptoms (excitation, dilated pupils, blindness, balance disorders, recumbency), heart failure, kidney failure, laminitis

Toxicity Snapshot

Toxic PartsAll parts of the plant, especially the bark and seeds
Exposure RouteOral ingestion is the primary exposure route; sap contact may cause mild skin irritation in sensitive individuals
Toxic CompoundsToxalbumins robin and phasin; Glycoside robinin

First Aid & Prevention

First 30 Minutes

  • • Prevent further ingestion by removing any remaining plant material from the affected individual's reach
  • • Contact a medical or veterinary professional immediately for guidance
  • • Administer activated charcoal only if explicitly directed by a qualified professional

Contact Vet Immediately

  • • Ingestion of any part of black locust is confirmed or suspected
  • • Symptoms like colic, dilated pupils, balance loss, or difficulty breathing appear
  • • The affected animal is a horse, as they are highly sensitive to this plant's toxins

Prevention

  • • Never tie horses near black locust trees
  • • Avoid using black locust wood shavings as animal bedding
  • • Keep the plant out of access to pets and livestock
  • • Learn to distinguish black locust from non-toxic Acacia species

Treatment & Prognosis

  • • Perform appropriate decontamination procedures as clinically indicated
  • • Provide targeted symptomatic and supportive care tailored to presented symptoms
  • • Closely monitor cardiac, renal, and neurological function during recovery
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Professional Toxicology

Scientific NameRobinia pseudoacacia L.
AliasesFalse acacia
Toxicity Grade
HumansModerate
CatsLow
DogsLow
HorsesHigh
Target Organs
Gastrointestinal tractCentral nervous systemHeartKidneys
Mechanism of Action

• Toxalbumin and glycoside compounds disrupt cellular function, damage organ tissue, and impair nervous, cardiac and renal system function

Other Species Risk (CliniTox)

Information from CliniTox veterinary text.

Cattle: Moderately toxic, 10 times less sensitive than horses; symptoms include loss of appetite, weakness, difficulty breathing, reduced intestinal motility, cold extremities, dilated pupils
Birds: Severely toxic; ingestion can cause rapid onset of severe adverse effects and potentially fatal outcomes
Confusion Risk

The following plants look similar and may be confused:

Subtropical Acacias Acacia sp.
Visually similar in leaf and flower structure; key difference is that Acacia species are non-toxic, while black locust is highly toxic to many animal species
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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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