Iron Cross Begonia Toxic?

Updated 2026-03-06| 2 min read| 2,067 found this helpful
Iron Cross Begonia
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This plant is confirmed toxic to cats, dogs, and horses per ASPCA toxicology data

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Soluble calcium oxalates are the primary toxic compound present in all plant parts

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Underground roots and rhizomes carry the highest toxicity concentration, with fatal kidney failure risk for grazing animals

FAQ

Is Iron Cross Begonia toxic to Humans?

Not formally documented, but may cause oral irritation, excessive salivation, vomiting, and rare kidney damage risk if large quantities are ingested (Low)

Is Iron Cross Begonia toxic to Cats?

Excessive salivation, oral pain and irritation, vomiting, reduced appetite after ingestion (Moderate)

Is Iron Cross Begonia toxic to Dogs?

Excessive salivation, oral pain and irritation, vomiting, gastrointestinal distress after ingestion (Moderate)

Is Iron Cross Begonia toxic to Horses?

Kidney failure, salivation, abdominal pain, lethargy, and potential fatality if large quantities are consumed (High)

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Toxicity Details

Humans
Low

Not formally documented, but may cause oral irritation, excessive salivation, vomiting, and rare kidney damage risk if large quantities are ingested

Cats
Moderate

Excessive salivation, oral pain and irritation, vomiting, reduced appetite after ingestion

Dogs
Moderate

Excessive salivation, oral pain and irritation, vomiting, gastrointestinal distress after ingestion

Horses
High

Kidney failure, salivation, abdominal pain, lethargy, and potential fatality if large quantities are consumed

Toxicity Snapshot

Toxic PartsUnderground roots and rhizomes are the most toxic; all above-ground foliage also carries low to moderate toxicity risk
Exposure RouteIngestion of any plant material via chewing, accidental consumption, or grazing
Toxic CompoundsSoluble calcium oxalates

First Aid & Prevention

First 30 Minutes

  • • Remove all remaining plant material from the exposed person/animal's mouth immediately
  • • Rinse the mouth thoroughly with cool clean water to reduce mucous membrane irritation
  • • Collect a sample of the ingested plant to share with medical or veterinary staff for accurate identification

Contact Vet Immediately

  • • If a cat, dog, or horse has ingested any quantity of this plant
  • • If symptoms including vomiting, excessive salivation, lethargy, or abdominal pain appear after exposure
  • • If a grazing animal is confirmed to have accessed and eaten this plant, to monitor for kidney damage risk

Prevention

  • • Keep potted plants out of reach of household pets, and avoid planting in pastures or areas accessible to horses or other grazing livestock
  • • Label plants clearly to alert caregivers, pet owners, and farm staff of their toxic status
  • • Teach children not to chew or consume any unknown house or garden plant material

Treatment & Prognosis

  • • Veterinarians may administer gastrointestinal decontamination (emetics, activated charcoal) for recent ingestions in small animals
  • • Supportive intravenous fluid therapy will be provided to reduce kidney damage risk, especially for horses and other grazing animals
  • • Symptomatic care for pain, irritation, and vomiting will be administered as needed for presenting clinical signs
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Professional Toxicology

Scientific NameBegonia masoniana
AliasesMason's Begonia
Toxicity Grade
HumansLow
CatsModerate
DogsModerate
HorsesHigh
Target Organs
Oral cavityGastrointestinal tractKidneys
Mechanism of Action

• Soluble calcium oxalate crystals irritate oral, esophageal, and gastrointestinal mucous membranes immediately upon ingestion

• Absorbed oxalates bind to circulating calcium in the body, forming sharp crystals that accumulate in kidney tissue and cause organ damage

Other Species Risk (CliniTox)

Information from CliniTox veterinary text.

Cattle, sheep, goats: High risk of kidney failure if consumed while grazing, consistent with horse toxicity data
Small pet mammals (rabbits, guinea pigs, hamsters): Moderate risk of oral irritation, salivation, and gastrointestinal distress if ingested
Pet birds: Low documented risk, but ingestion may cause mild digestive irritation
Confusion Risk

The following plants look similar and may be confused:

Rex Begonia Begonia rex
Visually similar due to textured, patterned foliage; key difference is Iron Cross Begonia has a distinct dark brown cross-shaped marking at the center of each leaf
Strawberry Begonia Saxifraga stolonifera
Often mislabeled as a begonia variant due to fuzzy rounded leaves; key difference is it produces long runner stems and small white flowers, and lacks the signature cross leaf marking
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Related Toxic Plants

Rex Begonia
Rex Begonia
Begonia rex
Moderate toxicity to cats, dogs, and grazing animals
Wax Begonia
Wax Begonia
Begonia x semperflorens-cultorum
Low to moderate toxicity to pets and livestock
Tuberous Begonia
Tuberous Begonia
Begonia × tuberhybrida
High toxicity, with tubers carrying the highest concentration of calcium oxalates

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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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