Flowers that can be poisonous to cats:

1. Lily flowers do not need to be chewed, and the pollen can cause harm to cats. Lilies can cause kidney failure in cats, and may also cause vomiting, lethargy, loss of appetite, and in severe cases, the cat may die.

2. The leaves and roots of chrysanthemum are poisonous to cats, and eating them may cause vomiting and diarrhea.

3. Tulips can cause cats to suffer from gastroenteritis.

4. Dieffenbachia rhizomes can cause cats to vomit, coma, or even die.

5. Hydrangeas are slightly less toxic than the above species, but they can also cause gastrointestinal discomfort in cats.

6. Aloe vera not only makes cats vomit, but also causes them to urinate light red urine.