If you notice your cat nibbling on your plants, don’t get upset. Move the plant out of the cats reach. They do this as a substitute for eating grass which is perfectly natural behavior for cats. Eating grass for them is like taking medication. It induces vomiting.  The reason why cats need to regurgitate is to get rid of those nasty hairballs that accumulate in their digestive system because of grooming.  Because cats can’t stick their paw down their throat, they instinctively seek out grass and plants. Since they eat anything green, it’s important that they don’t eat toxic plants. You can make sure that your cat doesn’t eat poisonous plants by buying special cat grass sold at pet supply stores. They also like parsley, sage thyme and lavender.