Deficiences~ Plants

Poisonous Plants

Autumn Crocus

There are two Crocus plants: one that blooms in the spring (Crocus species) and the other in the autumn Colchicum autumnale). The spring plants are more common and are part of the Iridaceae family. These ingestions can cause general gastrointestinal upset including vomiting and diarrhea. These should not be mistaken for Autumn Crocus, part of the Liliaceae family, which contain colchicine. The Autumn Crocus is highly toxic and can cause severe vomiting, gastrointestinal bleeding, liver and kidney damage, and respiratory failure. If you’re not sure what plant it is, bring your pet to their veterinarian immediately for care. Signs may be seen immediately but can be delayed for days.

Azalea

In the same family as rhododendrons, azaleas can have serious effects on pets. Eating even a few leaves can result in vomiting, diarrhea and excessive drooling; without immediate veterinary attention, the pet could fall into a coma and possibly die.

Cyclamen

The roots of this seasonal flowering plant are especially dangerous to pets. If ingested, cyclamen can cause severe vomiting and even death.

Kalanchoe

This popular flowering succulent plant can cause vomiting, diarrhea and heart arrhythmias if ingested by pets.

Lilies

There are dangerous and benign lilies out there, and it’s important to know the difference. Peace, Peruvian, and Calla lilies contain oxalate crystals that cause minor signs, such as tissue irritation to the mouth, tongue, pharynx, and esophagus – this results in minor drooling. The more dangerous, potentially fatal lilies are true lilies, and these include Tiger, Day, Asiatic, Easter and Japanese Show lilies – all of which are highly toxic to cats! Even small ingestions (such as 2-3 petals or leaves) can result in severe kidney failure. If your cat is seen consuming any part of a lily, bring your cat (and the plant) immediately to a veterinarian for medical care. The sooner you bring in your cat, the better and more efficiently we can treat the poisoning.

For more information on lilies, please visit our No Lilies for Kitties campaign.

Oleander

Oleander is an outdoor shrub, popular for its evergreen qualities and delicate flowers. However, the leaves and flowers are extremely toxic if ingested and can cause severe vomiting, slow the heart rate and possibly even cause death.

Dieffenbachia

Popular in many homes and offices, dieffenbachia can cause intense oral irritation, drooling, nausea, vomiting and difficulty swallowing if ingested.

Daffodils

These flowers contain lycorine, an alkaloid with strong emetic properties (something that triggers vomiting). Ingestion of the bulb, plant or flower can cause severe vomiting, diarrhea, abdominal pain, and even possible cardiac arrhythmias or respiratory depression. Crystals are found in the outer layer of the bulbs, similar to hyacinths, which cause severe tissue irritation and secondary drooling. Daffodil ingestions can result in more severe symptoms so if an exposure is witnessed or symptoms are seen, we recommend seeking veterinary care for further supportive care.

Lily of the Valley

The Convallaria majalis plant contains cardiac glycosides which will cause symptoms similar to digitalis (foxglove) ingestion. These symptoms include vomiting, diarrhea, a drop in heart rate, severe cardiac arrhythmias, and possibly seizures. Pets with any known exposure to this plant should be examined and evaluated by a veterinarian and treated symptomatically.

Sago Palm

Very popular in warmer climates, this household and outdoor plant can be very harmful to pets. If ingested, the leaves and seeds can cause vomiting, bloody stools, damage to the stomach lining, severe liver failure and, in some cases, death.

Tulips and Hyacinths

Tulips contain allergenic lactones while hyacinths contain similar alkaloids. The toxic principle of these plants is very concentrated in the bulbs (versus the leaf or flower), so make sure your dog isn’t digging up the bulbs in the garden. When the plant parts or bulbs are chewed or ingested, it can result in tissue irritation to the mouth and esophagus. Typical signs include profuse drooling, vomiting, or even diarrhea, depending on the amount consumed. There’s no specific antidote, but with supportive care from the veterinarian, animals do quite well. With large ingestions of the bulb, more severe symptoms such as an increase in heart rate and changes in respiration can be seen, and should be treated by a veterinarian. These more severe signs are seen in cattle or our overzealous, chowhound Labradors.

This is only a partial list of poisonous plants.  For a more complete list of plants poisonous to cats and dogs, visit our Poison List.

If you suspect your pet has ingested any of these items or any other questionable substance, call Pet Poison Helpline at 855-764-7661 or your veterinarian for assistance. Accurate and timely identification of the suspected substance is very important. Having the container, package, or label in hand will save valuable time and may save the life of your pet.

Poisonous Plants and Flowers

tomato plant
TOMATOES

TOMATOES

The leaves are toxic to cats and dogs so, if you grow them, or make sure that animals can’t get to them.

Potatoes

Woman and girl potato farming on remote island

Unripe, green or raw potatoes are dangerous to dogs, and the leaves are toxic too. Again, make sure your pets can’t get to them.

Autumn Crocus

Autumn Crocus

Not to be confused with the spring crocus (which can still cause vomiting and diarrhea), all parts of this plant are toxic. It can cause liver and kidney damage, seizures and death.

Lilies

lilly

Every part of a lily is toxic to cats (even one leaf or petal can make them very ill) and some kinds are poisonous to dogs as well. They are even toxic to horses.

Tulips

tulips flowers

They’re a member of the lily family, so it’s not surprising that they are also toxic to cats, dogs and horses. The toxins tulipalin A and tulipalin B are found within tulip bulbs, but if you think your pet has eaten any part of the plant, seek veterinary assistance immediately. 

Heavenly Bamboo

Heavenly Bamboo

Also known as sacred bamboo or the Nandina plant, this produces red berries that are very pretty, but dangerous. They contain cyanogenic glycosides, which release hydrogen cyanide when chewed.

Foxtails

Foxtails

Foxtails are spikelets that carry the seeds of the foxtail grass. They are barbed and meant to burrow into the ground to germinate – but this also means they could penetrate an animal’s body and damage internal organs. The ears are especially vulnerable.

It’s pretty much impossible to avoid this common weed, but you can check your pet’s body (especially entry points like the ears, mouth and eyes) after a walk, and uproot – not mow – any foxtails you see in the garden.

Sago Palm

Sago Palm

These ornamental houseplants are very poisonous to cats and dogs. The whole of the plant is dangerous, but the nuts are the worst. If you think your pet may have ingested some, take it to a vet immediately.

Castor Beans

Castor Beans


Ricin is a well-known poison, and it’s present in the bean of the castor oil plant – although all parts of the plant are toxic. Even tiny amounts can poison a cat or a dog and cause twitching, tremors, seizures, comas or death.-

Azaleas

Azaleas


A type of rhododendron, azaleas contain a poisonous substance called grayanotoxin, which can cause vomiting, diarrhoea, and even blindness and comas in cats and dogs.

Toxic Plants For Cats and Dogs

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