Yes, lilies are highly toxic to cats. True lilies (Lilium species) and daylilies (Hemerocallis species) are especially dangerous and can cause severe kidney failure in cats, which can be fatal if not treated promptly. All parts of these lilies—including petals, leaves, pollen, and even the water in a vase—are toxic. Even small amounts, such as a few petals or licking pollen off their fur, can lead to sudden kidney failure, neurological symptoms, and potentially death. Some of the most toxic lilies to cats are Asiatic lilies, Easter lilies, Japanese show lilies, Oriental lilies, Stargazer lilies, Tiger lilies, and daylilies. Other lilies like calla lily and peace lily, while not causing kidney failure, contain oxalate crystals that can cause milder symptoms such as mouth and throat irritation and vomiting. If a cat is suspected to have ingested any part of a lily, immediate veterinary attention is crucial because early treatment greatly improves survival chances. Symptoms of toxicity include vomiting, loss of appetite, lethargy, drooling, increased thirst and urination, and signs of kidney failure. Because of the extreme risk, it is strongly advised not to have these types of lilies in homes with cats or in places accessible to cats, including gardens accessible to outdoor cats.