Most people are not aware that most lily plants are incredibly toxic to cats. Furthermore, it appears that the flower industry is doing little to warn the public about these dangers.
In one study of pet owners whose cats had ingested lilies, only 27% of them were aware before the poisoning that lilies were toxic.
The toxins act quickly on the kidneys, shutting them down and causing further poisoning. Within three to seven days seizures and death are typical.