10 Common Poisonous Plants for Cats

Last update on May 24, 2021

Not everyone knows which plant is poisonous for cats and sadly, some highly toxic ones are also popular; you may have one in your home or garden already.

If you have a cat, better check these 10 common plants below.

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Colchicum autumnale

You may know it under the terms Autumn Crocus, Meadow Saffron, or Naked ladies.

Colchicum plants are deadly poisonous due to their colchicine content. They can cause Vomiting, Diarrhea, Difficulty breathing, Trembling, up to Shock, and Death. A Cat can also suffer from Liver damage, kidney failure, and bone marrow suppression. So far, no antidote is known...


Adenium obesum

Know as Sabi star, Desert Azalea or Desert Rose, Mock Azalea, Kudu lily, or Impala lily. The Adenium obesum produces a sap in its roots and stems that contain cardiac glycosides.

The symptoms can be Vomiting, Diarrhea, Depression, Anorexia, Heart rhythm abnormalities, up to Death...

Did you know this sap is used as arrow poison for hunting large game throughout much of Africa and as a fish toxin?



Commonly known as Jonquil, Rush daffodil, or Paper White, these are dangerous for Cats. All Narcissus species contain the alkaloid poison lycorine, mostly in the bulb but also in the leaves. They can cause many symptoms, including Diarrhea, Nausea, Vomiting, Trembling/Convulsions, Abdominal pain, Excessive drooling, Difficulty breathing, Heart rhythm abnormalities, and reduce the blood pressure.


Dieffenbachia amoena

Dumbcane is dangerous for cats as its cells contain needle-shaped calcium oxalate crystals called raphides. If a leaf is chewed, these crystals can cause a temporary burning sensation and erythema. Your cat can also suffer from vomiting, loss of appetite, and excessive drooling.



Tulipa - or simply Tulip - contains the chemical compounds named tuliposides and tulipalins, responsible for allergies.

The symptoms will most likely be Vomiting, Diarrhea, Excessive drooling, and Depression.


Bryophyllum delagoense

You may know the Kalanchoe under the names mother of millions, Chandelier Plant, or the devil's backbone. It is also sometimes named Mother-In-Law but be careful as that's also the name for the Monstera deliciosa which is quite different.

It contains bufadienolide cardiac glycosides which can cause fatal poisoning. For your cat, you can watch these symptoms: Vomiting, Diarrhea, Stomach upset, Weakness, and Heart rhythm abnormalities.

The Bryophyllum delagoensis displaces native plants. This species and its hybrids are quite toxic, especially the flowers.

In Australia, in the states of New South Wales and Queensland, it has been declared a noxious weed.


Convallaria majalis

The Lily of the Valley is highly poisonous. All parts are toxic, including the red berries which may be attractive to children.

It goes also by the names Convallaria, May bells, May Our Lady's tears, and Mary's tears.

In France, Lily of the Valley goes by the name Muguet. It is the usage to offer a sprig on the 1st of May when visiting a relative.


Cycas revoluta

All parts of the Cycas revoluta are toxic, and the seeds contain the highest level of the toxin, the cycasin. Cycasin causes gastrointestinal irritation, vomiting, excessive thirst. In high enough doses, leads to liver failure, icterus, hemorrhagic, and death.

It is commonly named Sago Palm, Coontie Palm, Cardboard Palm, King sago, Sago cycad, and Japanese cycad.


Nerium Oleander

Oleander, also commonly named Rose-Bay, has historically been considered a poisonous plant because some of its compounds may exhibit toxicity, especially to animals, when consumed in large amounts.

Among these compounds are oleandrin and oleandrigenin, known as cardiac glycosides, which are known to have a narrow therapeutic index and can be toxic when ingested.

It is deadly for cats, as it can cause excessive drooling, Nausea, Vomiting, Diarrhea, Abdominal pain, Trembling, Depression, Heart rhythm abnormalities, and Death.



The cyclamen also goes by the names Sowbread and Persian violet. It contains triterpenoid saponins, a group of naturally occurring plant substances that can irritate skin and are toxic to pets.

Your cat can suffer from Vomiting, Diarrhea, Drooling, Convulsions, Heart rhythm abnormalities, and sadly death.