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Begonia
Begonia spp.
Begonias are a large family of popular houseplants and garden flowers, but all species are toxic to cats. The primary toxic agents are soluble calcium oxalates, which are most heavily concentrated in the underground tubers, rhizomes, and root systems. The soluble oxalates can be absorbed into the bloodstream and — with large enough exposure — may cause more systemic effects including electrolyte imbalances. Cats that dig at potted begonias and chew on the roots or tubers face the greatest risk.
Important Notes
Symptoms: Drooling, vomiting, and diarrhea are the most common signs; in larger exposures, electrolyte disturbances can occur.
Roots and tubers most toxic: The leaves and flowers contain lower oxalate levels, but the underground portions are significantly more concentrated and must be kept inaccessible.
Action: Contact a vet if a cat has chewed on the root or tuber, or if more than mild drooling and one episode of vomiting occurs.
Potentially Toxic Parts
Root
Stem
Leaf
Flower
Possible Symptoms Reported in Cats
Vomiting
Gastrointestinal · Rapid (shortly after ingestion).
Liver Failure
Hepatic · Delayed (after toxin absorption).
Intense burning, redness, and irritation of the mouth, tongue, and lips; occasionally oral sores
Gastrointestinal · Immediate (upon biting or chewing).
Dysphagia (Difficulty swallowing)
Gastrointestinal · Rapid (associated with oral swelling/pain).
Hypersalivation (Excessive salivation)
Gastrointestinal · Immediate to rapid.
Disclaimer: This summary was compiled from multiple sources and is for informational use only. It is not a diagnosis or treatment plan. Toxicity can vary based on the substance, amount, plant part, and individual cat. If you think your cat may have been exposed to a toxic substance, contact a veterinarian right away.