I have cat who chews on indoor plants and my christmas tree. Are any plants poisonous to cats, & why does he chew/eat them??

Thanks!!

They are not poisonous and will not hurt them, I really have no idea why they do it but, I have 2 cats and a 5 month old puggle and they all have been eating the tree, well the cats eat the tree and the dog eats the garland!! My cats have always done it and when the tree is not up they eat the fake plants. My one cat kept eating the ribbon off of a balloon arrangement from my daughters b-day and then would vomit it up so, I had to get rid of it!! But, it won't hurt them and good luck trying to stop them!!

I've heard things about pointsettas but I'm still confused some say posionous some say just will make the kitty sick for a whlie. Ether way my cats are outside garage cats so I don't have to worry and I find pointsettas boring looking plants.

There are many things cats cannot eat. There is a list below. Thanks so much for voicing your concern.

http://www.peteducation.com/article.cfm?cls=0&cat=1276&articleid=1029

Or as "JS B" said...Toxic plants - http://www.cfainc.org/articles/plants.html

The xmas pointsetta is poisonous and xmas tinsel is lethal and will cost you a fortune to remove from your cats intestine if swallowed. BE CAREFUL.

Foods to Avoid Feeding Your Pet
- Alcoholic beverages
- Avocado
- Chocolate (all forms)
- Coffee (all forms)
- Fatty foods
- Macadamia nuts
- Moldy or spoiled foods
- Onions, onion powder
- Raisins and grapes
- Salt
- Yeast dough
- Garlic
- Products sweetened with xylitol
Warm Weather Hazards
- Animal toxins—toads, insects, spiders, snakes and scorpions
- Blue-green algae in ponds
- Citronella candles
- Cocoa mulch
- Compost piles Fertilizers
- Flea products
- Outdoor plants and plant bulbs
- Swimming-pool treatment supplies
- Fly baits containing methomyl
- Slug and snail baits containing metaldehyde

Medication
Common examples of human medications that can be potentially lethal to pets, even in small doses, include:
- Pain killers
- Cold medicines
- Anti-cancer drugs
- Antidepressants
- Vitamins
- Diet Pills

Cold Weather Hazards
- Antifreeze
- Liquid potpourri
- Ice melting products
- Rat and mouse bait

Common Household Hazards
- Fabric softener sheets
- Mothballs
- Post-1982 pennies (due to high concentration of zinc)

Holiday Hazards
- Christmas tree water (may contain fertilizers and bacteria, which, if ingested, can upset the stomach.
- Electrical cords
- Ribbons or tinsel (can become lodged in the intestines and cause intestinal obstruction—most often occurs with kittens!)
- Batteries
- Glass ornaments

Non-toxic Substances for Dogs and Cats
The following substances are considered to be non-toxic, although they may cause mild gastrointestinal upset in some animals:
- Water-based paints
- Toilet bowl water
- Silica gel
- Poinsettia
- Cat litter
- Glue traps
- Glow jewelry

Ten Most Common Poisonous Plants
Marijuana
Ingestion of Cannabis sativa by companion animals can result in depression of the central nervous system and incoordination, as well as vomiting, diarrhea, drooling, increased heart rate, and even seizures and coma.
Sago Palm
All parts of Cycas Revoluta are poisonous, but the seeds or “nuts” contain the largest amount of toxin. The ingestion of just one or two seeds can result in very serious effects, which include vomiting, diarrhea, depression, seizures and liver failure.

Lilies
Members of the Lilium spp. are considered to be highly toxic to cats. While the poisonous component has not yet been identified, it is clear that with even ingestions of very small amounts of the plant, severe kidney damage could result.

Tulip/Narcissus bulbs
The bulb portions of Tulipa/Narcissus spp. contain toxins that can cause intense gastrointestinal irritation, drooling, loss of appetite, depression of the central nervous system, convulsions and cardiac abnormalities.

Azalea/Rhododendron
Members of the Rhododenron spp. contain substances known as grayantoxins, which can produce vomiting, drooling, diarrhea, weakness and depression of the central nervous system in animals. Severe azalea poisoning could ultimately lead to coma and death from cardiovascular collapse.

Oleander
All parts of Nerium oleander are considered to be toxic, as they contain cardiac glycosides that have the potential to cause serious effects—including gastrointestinal tract irritation, abnormal heart function, hypothermia and even death.

Castor Bean
The poisonous principle in Ricinus communis is ricin, a highly toxic protein that can produce severe abdominal pain, drooling, vomiting, diarrhea, excessive thirst, weakness and loss of appetite. Severe cases of poisoning can result in dehydration, muscle twitching, tremors, seizures, coma and death.

Cyclamen
Cylamen species contain cyclamine, but the highest concentration of this toxic component is typically located in the root portion of the plant. If consumed, Cylamen can produce significant gastrointestinal irritation, including intense vomiting. Fatalities have also been reported in some cases.

Kalanchoe
This plant contains components that can produce gastrointestinal irritation, as well as those that are toxic to the heart, and can seriously affect cardiac rhythm and rate.

Yew
Taxus spp. contains a toxic component known as taxine, which causes central nervous system effects such as trembling, incoordination, and difficulty breathing. It can also cause significant gastrointestinal irritation and cardiac failure, which can result in death.

http://www.aspca.org/site/PageServer?pagename=pro_apcc_toxicplants