Outdoor Plants Poisonous to Cats

Updated February 21, 2017

Cats are curious animals by nature, and they will occasionally mouth or eat whole plants. If your cats spend time outdoors, make sure that the plants that they will encounter in your yard are not poisonous to them. Learn what outdoor plants are poisonous to cats and make sure that you do not plant them in a place where your cat can reach them.


The daffodil, also called narcissus, is a medium-sized plant that produces large, showy yellow flowers. While daffodils are a colourful addition to a garden, they produce diarrhoea and vomiting when they are eaten by cats.


The foxglove is a spiky plant that has small white and purple bell-shaped flowers. The foxglove is toxic to dogs and to horses as well as to cats, and some signs that a cat may have consumed foxgloves include weakness, vomiting, and diarrhoea. If a cat has consumed too much foxglove, it may have an erratic heartbeat, which may be indicative of cardiac arrest.


Larkspur is an erect plant that has thick stalks of flowers that range from dark to light purple. They grow wild west of the Mississippi River, but they are cultivated as ornamentals throughout the United States. The mature plant is less toxic than the young plant. Consumption of the plant may result in weakness, muscle tremors, convulsions and drooling. In severe cases, it can result in respiratory paralysis and cardiac failure.


Wisteria is a type of flowering plant that produces dropping groups of pale purple flowers. Consumption of wisteria by cats produces depression, diarrhoea and vomiting. In some cases, the vomiting is accompanied by blood from a distressed stomach lining and throat.

Skunk Cabbage

Skunk cabbage, also known as "swamp cabbage," "meadow cabbage," "skunk weed" and "polecat weed." When it is eaten, it causes a burning irritation in the cat's mouth, tongue and lips. If the cat consumes enough of the skunk cabbage, it may result excessive drooling or difficulty with swallowing. It may also cause the cat to vomit.

Morning Glory

Morning glories are flowers that close up during the night and open during the day. They come in a wide variety of colours and patterns. Cats that consume morning glories experience disorientation, agitaiton and tremors. They may also refuse to eat. If the cat eats the seeds, it can cause diarrhoea and hallucinations.

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