Safety verdict
Consulted references classify the plant as toxic or irritating for that pet type.
Pet ingestion lookup
My cat ate Iron Cross Begonia - what should I do?
Begonia masoniana
Potentially toxic
Contact your veterinarian or an animal poison-control resource now, especially if any amount was chewed or swallowed.
Verified against ASPCA/provenance audit 2026-05-06 on May 6, 2026.
Signs to watch for
Oral irritation, excessive drooling, difficulty swallowing, and vomiting.
Escalation note
The plant contains soluble calcium oxalates which cause immediate irritation upon contact with the mouth and throat. Please contact your veterinarian if ingestion is suspected.
First aid at home
Wipe out any visible plant pieces from your cat's mouth (a soft cloth works) and rinse with lukewarm water if she will tolerate it. Per VCA Animal Hospitals' guidance for toxic-plant exposure with drooling, offering a small amount of milk may help dilute the irritation. Do not try to induce vomiting in cats at home. Call your vet or the ASPCA Animal Poison Control Center (888-426-4435) before giving anything else.
What to watch for
Most common in cats: drooling, retching, and vomiting shortly after a chew. Pawing at the mouth or face is a giveaway sign of oral irritation. Loss of appetite for a meal or two is common. Severe systemic illness is rare from leaf chewing — far more likely if a cat got into the pot and chewed the tuber.
Time window
Onset is typically immediate — drooling and pawing at the mouth start within minutes of chewing, because the crystals act on contact. ASPCA does not publish a precise duration; oral irritation usually settles within a few hours and GI upset within 24 hours.
When to call the vet
Call the same day for any vomiting that doesn't stop after one episode, persistent drooling beyond an hour, or refusal to eat for more than 12 hours. Tuber/root ingestion is higher-risk — call your vet or ASPCA Animal Poison Control Center (888-426-4435) immediately. Mouth swelling that affects breathing is a 911-level emergency.
What this means for your cat
Cats that bite into Iron Cross Begonia leaves get a burst of soluble calcium oxalates — irritant crystals concentrated underground in the tubers and rhizome. The above-ground parts cause vomiting and drooling; the buried tubers are the most toxic part of the plant and the exposure to worry about. ASPCA lists begonia as toxic but not typically life-threatening for cats.
Sources: ASPCA, VCA Animal Hospitals.
Source references
Poison-control resources
This page summarizes source-bound plant-safety information and is not veterinary advice.