The most dangerous plants
- Lilies (Lilium, Hemerocallis): extremely toxic to cats — even pollen or vase water can cause acute kidney failure. Should be avoided entirely in a cat household.
- Dieffenbachia: contains irritating calcium oxalate crystals, causes mouth burns and excessive drooling if chewed.
- Pothos and Monstera deliciosa: also rich in calcium oxalates, causing oral irritation, vomiting, and difficulty swallowing.
- Snake plant (Sansevieria): mild to moderate toxicity, generally causing digestive upset (vomiting, diarrhea).
- Aloe vera: the sap can cause vomiting and diarrhea if ingested in quantity.
- Ficus (including rubber plant): irritating sap for skin and mucous membranes, digestive upset if ingested.
Symptoms to watch for
Excessive drooling, vomiting, diarrhea, difficulty swallowing, lethargy, or loss of appetite are the most common signs of toxic plant ingestion. For lilies specifically, reduced or absent urine output within 24-48 hours is an absolute emergency sign.
What to do if you suspect ingestion
Contact your veterinarian or a veterinary poison control center immediately — don't wait for symptoms to appear, especially with lilies, where every hour counts. If possible, keep a piece of the plant or its name to help with identification.