The following plants are all dangerous to some degree. Some, like oleander and Dieffenbachia (dumb cane) can cause death almost instantly. Others may cause only a mild reaction, but it is still best to remove them from any areas where they would be in contact with your pet.
This is not a complete list, so if you are in any doubt about the safety of plants that you have, please contact your veterinarian or the poison control center. The ASPCA National Animal Poison Control Center hotline numbers are as follows:
Plants dangerous for small animals:
Air plant Amanita Amaryllis American yew Andromeda Arum lily Autumn crocus Australian flame tree Avocado Azalea Balsam pear Baneberry Bird of paradise Bishop's weed Black laurel Black locust Bloodroot Bluebonnet Blue-green algae Boxwood Bracken fern Broad beans Broomcorn grass Buckeye Buckthorn Bulb flowers Burdock Buttercup Cacao Caladium Calla lily Camel bush Candelabra tree Cardinal Castor Bean Chalice vine Cherry tree Chinaberry tree Christmas candle Clematis Cocklebur Coffee Coffee bean Coral plant Coriander Corncockle Cotton bush Cowslip Coyotillo Crown of thorns Cutleaf Daffodil Daphne Datura Deadly amanita Death camus Delphinium Devil's ivy Dieffenbachia Dutchman's breeches Eggplant | Elderberry Elephant's ear English ivy English yew Ergot Eucalyptus Euonymus False hellebore False henbane Flame tree Felt plant Firethorn Four o'clock Foxglove Ghostweed Glottidium Golden chain Ground cherry Johnson grass Heliotrope Hemlock Henbane Holly Honeysuckle Horse bean Horse chestnut Horsetail Hyacinth Hydrangea Indian licorice Indian turnip Inkberry Iris Jack-in-the-pulpit Java bean Lima bean Jasmine Jerusalem cherry Jimsonweed Juniper Kentucky coffee tree Lantana Larkspur Laurel Leucotho Lily-of-the-valley Lima bean Lobelia Locoweed Lords and ladies Lupine Malanga Mandrake Marijuana Maternity plant Mayapple Meadow saffron Mescal bean Mexican breadfruit Mexican poppy Milk vetch Milkweed | Mistletoe Mock orange Monkshood Moonseed Morning glory Mountain laurel Mushrooms Narcissus Navy bean Nettles Nightshades Oak Oleander Panda plant Parsley Peires Pencil tree Periwinkle Philodendrons Pigweed Pikeweed Poinciana Poinsettia Poison ivy Poison oak Pokeweed Potato Precatory Privet Pyracantha Rain tree Ranunculus Rape Rattlebox Rattlebush Red maple Rhubarb Rhododendrons Rosary peas Sandbox tree Scarlet runner Skunk cabbage Snowdrop Snow on the mountain Sorghum grass Sorrel Spindle tree Spurges Sudan grass Sweet pea Tansy ragwort Tobacco Thornapple Vetch Virginia bower Virginia creeper Wattle White cedar Wisteria Yam bean Yews Yellow jasmine |