A surprisingly large number of common garden and household plants are toxic to pets, and reactions to toxicity range from mild to life-threatening. Pets, like young children, explore the world with their senses, and they are therefore vulnerable to accidental poisoning. Many of these plants make wonderful additions to the garden, but it is important to know which plants are toxic. If possible, avoid planting these where pets (or children) will have frequent unsupervised access to the plants.
The 12 plants listed below are responsible for the majority of calls to our Veterinary Medical Teaching Hospital (VMTH) about possible plant poisoning. The list was compiled by Director of Pharmacy Dr. Valerie Wiebe. The toxicity of the plants below varies according to the species of animal exposed (cat, dog, bird, etc.), the amount of the plant that was ingested, and the specific variety or species of the plant.
If you suspect your pet has ingested any of the plants below, call your veterinarian immediately. Do not wait to see if symptoms appear, because in some cases of poisoning, by the time symptoms appear it is too late to save the animal.
- Lilies (Lilium, all spp.): Ingesting any part of the plant can cause complete kidney failure in 36-72 hours. First symptoms appear in a few hours and may include appetite suppression, lethargy, vomiting. Cats are especially sensitive to lily poisoning, so be very careful to keep your cats away from liliies of any kind, including the Amaryllis, Easter lilies, and Stargazer lilies so often found in homes around the holidays.
- Lily of the Valley (Convallaria majalis): Ingesting any part of the plant can cause cardiac dysrhythmias, vomiting, diarrhea, confusion, weakness, and even death. (Photo courtesy of freebigpictures.com web site).
- Anemone (Anenome and Pulsatilla, family Ranunculaceae): Irritating to the mucus membranes, and can cause blisters, hemorrhagic gastritis, shock, convulsions, and death. (Photo is Japanese Anemone).
- Aloe Vera (family Liliaceae): Vomiting, depression, diarrhea, anorexia, tremors, change in urine color.
- Amaryllis (family Amaryllidaceaea, incl. Hippeastrum spp.) All species, including Belladonna Lily, are toxic, and especially dangerous to cats. The bulbs are the toxic part of the plant. The “Amaryllis” commonly seen during the December holidays are Hippeastrum species. Symptoms include vomiting, depression, diarrhea, abdominal pain, hyper-salivation, anorexia, tremors. (Photo courtesy of Ellen Zagory, UC Davis Arboretum).
- Asparagus Fern (family Liliaceae): Allergic dermatitis, gastric upset, vomiting, diarrhea.
- Daffodil (Narcissus): Vomiting, diarrhea. Large ingestions cause convulsions, low blood pressure, tremors, cardiac arrhythmias.
- Philodendrons: Irritation, intense burning and irritation of the mouth, lips, tongue, excessive drooling, vomiting, difficulty swallowing.
- Jade Plants (Crassula argentea): Vomiting, depressions, ataxia, slow heart rate.
- Chrysanthemums: Vomiting, diarrhea, hyper salivation, incoordination, dermatitis.
- Cyclamen (Cyclamen persicum): The tubers or rhizomes contain the toxic glycoside cyclanin, a terpenoid saponin. Ingestion can cause excess salivation, vomiting, diarrhea, heart rhythm abnormalities, seizures, or even death in rare cases.
- Cycads (including Sago palm; cardboard palm; etc.): The “Sago palm” is a cycad, not a true palm, and all parts of the plant are poisonous. Symptoms include vomiting, lethargy, melena (black “tarry” feces), icterus (jaundice), increased thirst, hemorrhagic gastritis, bruising, coagulopathy, liver failure, and death. A northern California police dog, a patient at one of our Companion Animal Memorial Fund donor clinics, died in November 2011 after ingesting parts of this plant.
Common plants that are highly toxic but only rarely ingested by pets include:
- Angel’s Trumpet (Brugmansia spp.)
- Castor bean (Ricinus communis)
- Daphne (Daphne spp.)
- Deathcamas & Meadow Deathcamas (Zigadenus venenosus)
- English yew (Taxus baccata)
- Foxglove (Digitalis purpurea)
- Jimson weed or Devil’s Trumpet (many common names) (Datura spp.)
- Nicotiana/Tobacco plants (all spp.)
- Oleander (Nerium Oleander)
- Poison hemlock (Conium maculatum)
- Pokeweed (Phytilacca americana)
- Tree tobacco (Nicotiana glauca)
- Western water hemlock (Cicuta douglasii)
- Yew (Taxus cuspidata)