PET SAFETY ANSWER · CITED TO ASPCA
Is Begonia safe for cats?
Why it's toxic
Toxic principles: Soluble calcium oxalates
Clinical signs in cats: Kidney failure (in grazing animals), vomiting, salivation in dogs/cats. Most toxic part is underground.
Severity rating: moderate
Source
Classification per the ASPCA Toxic and Non-Toxic Plants database entry for Begonia. Verified 2026-05-28. We update these answers when ASPCA changes the classification.