Cats like to chew on green foliage, and this means chewing on indoor plants that can have serious effects to their health. Poisonous plants for cats are common in many houses and can lead to illness or death of your pet. If you currently have plants inside your house we advise moving them to an area that the cat cannot reach. Sometimes the problem is not the plant itself, but the insecticide sprayed on it. Rarely cats will chew on poisonous plants in your garden.

If you suspect that your cat may be poisoned, contact a veterinary emergency center or our hospital immediately.  Don?t panic. If you witness your pet consuming material that you suspect might be toxic, do not hesitate to seek emergency assistance, even if you do not notice any adverse effects. Sometimes, even if poisoned, an animal may appear normal for several hours or for days after the incident.  Collect  any material involved and bring to us. This may be helpful in determining what poison or poisons are involved. Also, collect in a sealable plastic bag any material your pet may have vomited or chewed. 

 The best step to ensure that your cat is free of intoxication risks is to stop your cat from chewing on plants.  Training them to avoid this behavior can significantly lower future risks. One way to do it is using lemon juice.

Dilute lemon juice and regularly spray it on the leaves.  This juice is not well tolerated by cats and kittens so they will often quit chewing the leaves after tasting the juice on the leaf they are biting. 

Do not do this on poisonous plants, these plants must be taken out completely, 
only use this method on safe plants as a form to condition your cat without running any risk.

A list with pictures is available at the 

ASPCA POISON CONTROL CENTER WEBSITE