Normally, your cat knows what is good, or not, for him. He should not ingest these plants.
However, it is prudent not to take any risks.
Here is a list, non-exhaustive , plants that your cat should not eat.
Alocasia > irritation of the skin and mucous membranes, difficulty swallowing, vomiting...
Chlorophytum > Kidney damage that can lead to death.
Dracaena > May cause vomiting, loss of appetite, hyper salivation, listlessness.
Ficus > In case of contact with the latex contained in this plant: digestive disorders, hyper salivation, kidney damage.
Potos > Digestive and/or respiratory disorders.
Monstera > hyper salivation, respiratory problems, vomiting...
Sanseveria > local irritations, digestive disorders, risk of nervous symptoms if consumed in large quantities.
Azalea > hyper salivation, weakness, frequent deaths.
Chrysanthemums > digestive disorders
Crocuses > digestive disorders, respiratory disorders, convulsions...
Digital > heart trouble
Hydrangea > Asphyxiation which can lead to death.
Holly > Pay particular attention to berries which can cause digestive and/or nervous disorders. If swallowed, coma or even death.
Ferns > hemorrhagic diarrhoea.
Hyacinths > vomiting and diarrhea
Ivy > In particular the ivy producing berries which can cause digestive and/or respiratory disorders.
Oleander > Extremely toxic. Digestive, cardiac, respiratory, nervous disorders. Asphyxiation which can lead to death.
Lily of the valley > Very toxic. Causes heart problems, vomiting, convulsions, hyper salivation.
Jasmine / False Jasmine > digestive disorders, and sometimes neuromuscular, hyper salivation...
Daffodils > Digestive disorders, hypersalivation...
Tulips > Digestive, neurological disorders...
In the kitchen / vegetable garden:
Garlic > toxic in all its forms: diarrhea, vomiting, blood in the urine...
Chives > Same toxicity as garlic or onion
Shallots > digestive, respiratory problems...
Onions > dark urine, apathy, vomiting, diarrhoea, respiratory problems...
Parsley > toxic if ingested in large quantities.
Tomato plants > hyper salivation, loss of appetite, digestive disorders, weaknesses, heart problems...
Rhubarb > neurological disorders
⚠ In case of doubt or ingestion ⚠
Contact your veterinarian (or veterinarian) as soon as possible, describing the symptoms observed and identifying the plant in question.