Here is a quick reference guide to the more common house and garden plants and foods (and other substances) that are toxic to most all animals. If you have these plants or foods, you need not dispose of them--just keep them away from your pets. Although it is impossible to list all possible poisons, these guidelines may help you begin to remove or place out of reach most potential problems.
This list is NOT ALL INCLUSIVE and may not include items poisonous to Hamsters/Guinea Pigs/Iguanas/etc
* Indicates that a substance is especially dangerous and can be fatal.
Foods which are toxic and poisonous to pets:
Alcohol (all alcoholic beverages, ethanol, methanol, isopropyl)
Almonds*
Apples seeds
Apricots*
Avocado*
Broccoli (in large amounts)
Cherry pits
Chocolate (all types)*
Coffee grounds, beans & tea (caffeine)
Figs
Garlic*
Grapes
Hops (used in home brewing)
Macadamia Nuts
Milk
Mouldy/spoiled foods
Mushrooms
Nutmeg
Onions*
Peaches*
Pear seeds
Plum seed/pit
Potato (leaves & stem, peelings, and unripe green potatoes)
Raisins
Rhubarb leaves*
Sugar Free items with Xylitol (see below)***
Tomatoes (leaves & stem, and green tomatoes)
Walnut hulls
Yeast dough
Plants which are toxic and/or poisonous to pets:
Almonds*
Amaryllis bulb*
Andromeda
Anthuriaum*
Apple seeds (contain cyanide)
Apricot*
Arrowgrass
Autumn crocus (Colchicum Autumnale)*
Avocado (leaves, seeds, stem, skin)* (fatal to birds)
Azalea (entire rhododendron family)
Begonia*
Bird of Paradise
Bittersweet
Bleeding heart*
Boxwood
Bracken fern
Buckeye
Buttercup (Ranunculus)
Caffeine
Caladium*
Calla lily*
Castor bean or castor oil plant* (can be fatal if chewed)
Cherry pits (contain cyanide)
Cherry Chinese sacred or heavenly bamboo*
Chocolate Choke cherry, unripe berries*
Chrysanthemum (a natural source of pyrethrins)
Clematis
Crocus bulb
Croton (Codiaeum sp.)
Crown of Thorns
Daffodil
Daphne
Delphinium, larkspur, monkshood*
Dieffenbachia
Dumb cane (Dieffenbachia)*
Elderberry, unripe berries*
Elephant Ear
English ivy (All Hedera species of ivy)
Fig (Ficus)
Four-o'clocks (Mirabilis)
Foxglove (Digitalis)*
Garlic*
Grapes/raisins
Hemlock
Hemp
Hyacinth bulbs
Hydrangea*
Holly berries
Iris corms
Jack-in-the-pulpit*
Jasmine
Jerusalem Cherry, Winter Cherry (Solanum pseudocarpum)
Jimsonweed* (Datur stramonium, D. metaloides, D. arborea)
Kalanchoe*
Lantana*
Larkspur
Laurel
Lily (bulbs of most species)
Lily (Easter Lily, Tiger Lily)
Lily-of-the-Valley*
Locoweed
Lupine species
Marigold
Marijuana or hemp (Cannabis)
Milkweed*
Mistletoe berries*
Monkshood
Morning Glory*
Mostera, aka Split-Leaf Philodendron or Swiss Cheese Plant
Mountain laurel
Mushrooms & Toadstools (various)
Narcissus, daffodil
Nettles
Nightshade (various species)
Nutmeg (Myristica fragrans)
Oak* (remove bark for use as a bird perch)
Oleander*
Onions*
Peaches*
Pear seeds
Pencil cactus/plant* (Euphorbia sp.)
Periwinkle (Vinca rosea)
Peyote (Lophophora williamsii)
Philodendron (all species)*
Plum pit/seed
Poinsettia (many hybrids, avoid them all)
Poison Ivy
Potato (leaves & stem, peelings, unripe green potatoes)
Precatory Beans (Crabs Eye, Rosary Pea, Jequirity Bean) Used in jewelry. Extremely toxic when seedcoat is broken, as it is when the seeds are strung
Privet
Rhodedendron
Rhubarb leaves*
Rosary Pea (Arbus sp.) (can be fatal if chewed)
Scheffelera (umbrella plant)*
Shamrock (Oxalis sp.)*
Skunk Cabbage
Snow-on-the-Mountain
Spurge (Euphorbia sp.)
Tobacco
Tomatoes (leaves & stem, green tomatoes)
Tulip
Walnut hulls
Water Arum
Wisteria
Yew*
Other substances that are very harmful include (but are not limited to):
Acetaminophen
Acetone
Antifreeze
Aspirin
Bleach
Boric Acid
Brake Fluid
Carbon Monoxide
Carbuerator Fluid
Cigarettes and other nicotine products and smoke
Cleaning Fluids
Cosmetics
Crayons (dangerous for birds)
Deoderant
Deodorizers
Detergents
Diet Pills
Disinfectants
Drain Cleaners
Dyes
Fungicides
Furniture Polish
Gasoline
Hair Coloring
Herbicides
Insecticides
Kerosine
Laundry supplies & fabric softener
Laxatives
Lead
Liquor
Lye
Matches
Mercury
Metal Polish
Mineral Spirits
Mothballs
Nail Polish & Nail Polish Remover
Paint
Paint Remover
Permananet Solution
Phenol
Photo Developer
Rodent poison
Rubbing Alcohol
Rust (dangerous for birds)
Shoe Polish
Sleeping Pills
Slug/Snail Bait
Soap
Sugar Free foods (see below)***
Suntan Lotion
Tar
Turpentine
Window Cleaners
Wood preservatives and shellac
Xylitol sweetener - found in many diet drinks
Fumes dangerous to birds: smoke-filled air, insecticide spray, deodorizers, spray cleaners, fumes from fresh paint, gas, and overheated Teflon (very deadly).
From http://www.pacc911.org/Poison_Control.html