Cats are naturally curious, and that curiosity often extends to chewing on leaves, flowers, or stems. Unfortunately, many plants — even ones that look harmless — can be dangerous or even deadly to felines.
At Small Animal Intensive Veterinary (SAIVET), we frequently see emergencies caused by accidental ingestion of toxic plants. The safest approach is to identify and eliminate potentially dangerous species from your house and yard before your cat has the chance to investigate.
This guide, created with insights from Small Animal Intensive Veterinary (SAIVET), outlines 10 common plants that are harmful to cats and the warning signs of toxicity.
Note: This is not a complete list. If you’re unsure about a plant’s safety, always consult your veterinarian.
1. Lilies – Extremely Dangerous to Cats
Lilies are among the most hazardous plants for felines. Every part of the plant — petals, leaves, pollen, stems, and even water from the vase — contains toxins that can trigger acute kidney failure.
Toxic species include: Daylily, Japanese Show Lily, Easter Lily, Tiger Lily, Stargazer Lily, and other members of the Lilium and Hemerocallis families.
Warning signs (2–4 hours after ingestion):
- Vomiting or diarrhoea
- Excessive drooling
- Reduced appetite
- Abdominal discomfort
- Lethargy
- Increased thirst
Important: Kidney damage can be irreversible — seek immediate veterinary care.
2. Sago Palm / Cycads
Common in gardens, these small palm-like plants contain cycasin, a toxin that can cause severe liver failure. All parts of the plant are dangerous, but the seeds are the most toxic.
Symptoms:
- Vomiting and diarrhoea
- Weakness
- Loss of coordination
- Seizures
- Coma or death in severe cases
3. Autumn Crocus
While beautiful, the autumn crocus contains colchicine, which can cause multi-organ damage and bone marrow suppression in cats.
Signs of poisoning:
- Bloody vomiting
- Severe diarrhoea
- Lethargy and weakness
- Rapid or irregular heartbeat
- Breathing difficulties
4. Oleander
This ornamental shrub contains cardiac glycosides, which interfere with normal heart function. Ingesting even a small amount — or water from its vase — can be life-threatening.
Symptoms to watch for:
- Irregular heart rhythm
- Weakness
- Excessive drooling
- Vomiting
- Seizures
5. Cyclamen
Cyclamen contains toxic saponins, particularly in the tubers and roots. Chewing can irritate the mouth and digestive tract, while large ingestions can affect the heart.
Possible signs:
- Drooling
- Vomiting
- Diarrhoea
- Abnormal heartbeat
- Seizures
6. Chrysanthemums
Bright and cheerful, chrysanthemums contain pyrethrins — compounds also found in some insecticides — which cats are particularly sensitive to.
Symptoms:
- Vomiting
- Diarrhoea
- Loss of appetite
7. Azaleas
Azaleas, part of the rhododendron family, contain grayanotoxins that can affect the muscles, nervous system, and heart.
Signs of ingestion:
- Drooling, vomiting, diarrhoea
- Abnormal heart rhythm
- Weakness or low blood pressure
- Tremors or seizures
- Temporary vision loss (severe cases)
8. Daffodils, Hyacinths, and Tulips
These spring favourites contain toxic alkaloids, most concentrated in the bulbs. Small exposures can cause mild irritation, while larger ingestions can impact breathing and heart function.
Mild symptoms:
- Drooling
- Gastrointestinal upset
Severe symptoms:
- Tremors
- Breathing difficulties
- Irregular heartbeat
9. Lantana
Considered a weed in some areas, lantana contains pentacyclic triterpenoids, which can cause liver problems in animals.
Possible symptoms:
- Vomiting
- Diarrhoea
- Weakness
- Reduced appetite
- Laboured breathing
10. Philodendrons
A common indoor plant, philodendrons contain calcium oxalate crystals, which can irritate the mouth, throat, and digestive system.
Signs of irritation:
- Drooling
- Pawing at the mouth
- Vomiting
- Reduced appetite
- Rarely, swelling of the airways
Protecting Your Cat from Plant Poisoning
If you suspect your cat has eaten any part of a toxic plant, seek veterinary help immediately. Quick action can make all the difference.
Prevention tips from Small Animal Intensive Veterinary (SAIVET):
- Remove or place toxic plants out of reach.
- Offer safe alternatives like cat grass.
- Supervise your cat outdoors.
- Learn to recognise early symptoms of poisoning.
Your cat’s safety begins with awareness. Keeping your home and garden free from hazardous plants greatly reduces the risk of a medical emergency, helping ensure your feline companion enjoys a long, healthy life.
