By Jean Hofve, DVM
Aconite (Monkshood, Wolfsbane)
Agaricus Mushrooms
Aloe 1
Amanita Mushrooms
Amaryllis
Avocado (leaves, seeds)
Azalea
Baneberry
Black Walnut
Bleeding Heart
Bouncing Bet (Soapwort)
Bulbs (Lily, Daffodil, Tulip, Iris, Hyacinth, Amaryllis, Cyclamen, etc.)
Caladium
Catnip 2
Castor Bean (seeds)
Celandine
Cherries (Black Cherry, Bitter Cherry, Choke Cherry, Pin Cherry)
Christmas Rose
Clovers
Cocklebur
Coffee Tree ( Kentucky Mahogany, American Coffee Bean Tree, Nicker Tree)
Comfrey
Common Burdock
Cow Cockle
Curly Vetch
Creeping Charlie
Daffodil
Daphne
Death Camas
Delphinium
Dogbane
Doll’s-eyes
Dumbcane (Diffenbachia spp.)
Easter Lily
English Ivy
Ergot
Fireweed (Summer Cypress, Burning Bush)
Foxglove
Foxtail Barley
Garlic 3
Golden Chain (Laburnum)
Great Lobelia (Cardinal Flower, Indian Tobacco)
Ground Ivy (Creeping Charlie, Gill-over-the-Ground
Groundsels
Hemp (Cannabis spp.)
Henbane
Holly Berry
Horse Chestnut
Hyacinth
Hydrangea
Irises
Japanese Pieris
Japanese Yew
Jerusalem Cherry
Jessamine
Jimsonweed (Stinkweed, Thornapple, Mad Apple, Devil’s Trumpet, Angel’s Trumpet; Datura spp.)
Johnsongrass
Latana (Red Sage, Yellow Sage, West Indian Latana)
Larkspurs
Lily
Lily-of-the-Valley
Lupine (Bluebonnet)
Marijuana
Marsh Marigold (Cowslip)
Mayapple (Mandrake)
Mexican Poppy
Milkweed
Mistletoe
Monkshood
Narcissus
Nightshade (Black Nightshade, Deadly Nightshade)
Oak Trees
Oleander
Onions and Chives
Panther
Peace Lily (Spathiphyllum)
Philodendron
Pink Lady’s Slipper
Poison Hemlock, Water Hemlock
Poison Ivy
Poison Oak
Poison Sumac
Poinsettia
Pokeweed
Poppies
Potato (green, sprouts)
Pothos
Privet (berries)
Purple Mint
Red Maple
Redroot (Pigweed, Carelessweed)
Rhododendron
Rhubarb
Rosary Pea
Scarlet Pimpernel
Snow-on-the-Mountain
Spurges (Euphorbia spp.)
Stinging Nettle
Sweet Pea (Tangier Pea, Everlasting Pea, Caley Pea and Singletary Pea)
Tansy
Thorn Apple (Jimsonweed)
Tobacco (Tree Tobacco)
Tulips
Tung Oil Tree
Umbrella Tree
Virginia Creeper
Water Hemlock (Cowbane)
Wisteria
Yew
This list was compiled by Little Big Cat from sources at Cornell University, University of Illinois, University of Pennsylvania, the Canadian Poison Plants Information System, and Purdue University.
1. Aloe leaves contain latex, which can be irritating to the colon and may cause diarrhea.
2. Not all cats are responsive to catnip, and not all cats respond favorably. Some cats become aggressive on catnip. Never give your cat catnip before a visit to the veterinarian or other stressful event!
3. A member of the onion family, garlic can cause hemolytic anemia if consumed in large amounts.