Toxic and Poisonous Plants
Many of the plants with which we commonly landscape are toxic to humans and pets. Most accidental poisonings occur in children under 7 years of age and many of them are due to very young children eating the leaves, berries and flowers of common garden plants. It's important to know which plants in your yard may be harmful. It's also important to teach young children never to eat anything that Mom or Dad hasn't approved. Never assume that the plant your child has sampled is harmless. 

The following list is arranged alphabetically by common name. Taxonomic names are also given. The effects of these plants vary. Not all parts of every plant are harmful if eaten (you'll even notice some common foodstuffs listed) so it's important to have as much information at hand as possible when you call your local Poison Control Center or your doctor. 

Be Prepared When You Make Your Call:

  • Remove any remaining material from the child's mouth and keep it. If the child has spit it out, collect the material so that you can identify what plant or part of the plant was ingested. 
  • If possible bring a sample of the plant to the phone to use for descriptive purposes. 
  • Have the child's age, weight and medical history available. 
  • Always keep an unexpired bottle of Syrup of Ipecac and one of activated charcoal suspension in the house. These are available from your local pharmacy and you may be told to go buy one of them, depending on what your child has ingested. NEVER GIVE EITHER MEDICATION TO A CHILD IWTHOUT BEING TOLD TO BY A MEDICAL PROFESSIONAL. 
  • Follow the instructions given by your doctor or Poison Control Center exactly. Answer all questions that you're asked. Try to remain patient even though it may seems that the call is taking a long time.
Common Name Taxonomic Name
Alfalfa or Lucerne Medicago sativa 
Alsike Clover, Red Clover, White Clover Trifolium spp. 
Arrowgrass Triglochin maritima 
Baneberry and Doll's-eyes Actaea spp. 
Belladonna or Deadly Nightshade Atropa belladonna 
Birdsfoot Trefoil Lotus corniculatus 
Black Locust Robinia pseudoacacia 
Bleeding Heart, Squirrel Corn, Dutchman's Breeches Dicentra spp. 
Bloodroot Sanquinaria canadensis 
Bouncing Bet and Cow Cockle Saponaria spp. 
Bracken Fern Pteridium aquilinium 
Buckwheat Fagoypyrum esculentum 
Buttercups or Crowfoot Ranunculus spp. 
Castor Bean Ricinus communis 
Celandine Chelidonium majus 
Christmas Rose Helleborus niger 
Cocklebur Xanthium strumarium 
Commercial Onions, Wild Onions, Swamp Onions, and Chives Allium spp. 
Common Nightshade, Black Nightshade, Horse Nettle, Buffalo Bur Potato Solanum spp.,
Common Vetch, Hairy Vetch, Narrow-leaved Vetch, Purple Vetch and Broad Beans Vicia spp. 
Corn Cockle Agrostemma githago 
Corn Lily, False Hellbore Veratrum californicum 
Crown Vetch Coronilla varia 
Daphne Daphne spp. 
Death Camas Zigadenus spp. 
Delphiniums and Larkspurs Delphinium spp. 
Dock Rumex spp. 
Dogbane Apocynum spp. 
Drooping Leucothoe and Sierra Laurel Leucothoe axillaris and Leucothoe davisiae 
Eastern Skunk Cabbage Symplocarpus foetidus 
Elderberry Sambucus canadensis 
Ergot Claviceps spp. 
Fiddleneck Amsinckia intermedia 
Flax Linum usitatissimum 
Foxglove Digitalis purpurea 
Golden Chain or Laburnum Laburnum anagyroides 
Great Lobelia, Cardinal Flower, and Indian Tobacco Lobelia spp. 
Ground Ivy, Creeping Charlie, and Gill-over-the-Ground Glechoma spp. 
Halogeton Halogeton glomeratus 
Henbane Hyoscyanmus niger 
Horse Chestnut, Buckeye Aesculus spp. 
Horsebrush Tetradymia spp. 
Horsetail Equisetum arvense and other spp. 
Irises Iris spp. 
Jack-in-the-Pulpit Arisaema spp. 
Japanese Pieris, Mountain Fetterbush Pieris japonica and other spp. 
Jessamine Gelsemium sempervirens 
Jimsonweed, Downy Thornapple, Devil's Trumpet, and Angel's Trumpet Datura spp. 
Lamb's Quarters Chenopodium album 
Lily-of-the-Valley Convallaria majalis 
Locoweed Astragalus and Oxytropis spp. 
Lupine Lupinus spp. 
Marijuana Cannabis sativa 
Marsh Marigold or Cowslip Caltha palustris 
Mayapple and Mandrake Podophyllum peltatum 
Milkweed Asclepias spp 
Monkey Agaric, Panther Cap, Death Cap, and Death Angel Mushrooms Amanita spp. 
Monkshood, Aconite, or Wolfsbane Aconitum spp. 
Moonseed Menispermum canadense 
Oak Trees Quercus spp. 
Oleander Nerium oleander 
Pigweed Amaranthus spp. 
Poinsettia, Spurges, Snow-on-the-Mountain Euphorbia spp. 
Poison Hemlock Conium maculatum 
Poison ivy Toxicodendron radicans 
Poison oak Toxicodendron diversiloba 
Poison Sumac Toxicodendron vernix 
Pokeweed Phytolacca americana 
Ponderosa Pine Pinus ponderosa 
Prickly Poppy or Mexican Poppy Argemone mexicana 
Rape, Cabbage, Turnips, Broccoli, Mustard Brassica spp, 
Red Sage, Yellow Sage, or West Indian Lantana Lantana camara Lantana, 
Rhubarb Rheum rhaponticum 
Rosary Pea Abrus precatorius 
Senecio, Groundsels, and Ragworts Senecio spp. 
Sensitive Fern Onoclea sensibis 
Sorghum or Milo, Sudan Grass, and Johnson Grass Sorghum spp. 
St. John's Wort Hypericum perforatum 
Star-of-Bethlehem Ornithogalum umbellatum 
Stinging Nettle Urtica spp. 
Sweet Pea, Tangier Pea, Everlasting Pea, Caley Pea and Singletary Pea Lathyrus spp. 
Tall Fescue Festuca arundinacea 
Tobacco and Tree Tobacco Nicotiana spp. 
Tung Oil Tree Aleurites fordii 
Various Poppies including Opium Poppy Papaver spp. 
Water Hemlock or Cowbane Cicuta spp. 
White and Yellow Sweetclover Melilotus alba and Melilotus officinalis 
White Snakeroot Eupatorium rugosum 
Wild Cherries, Black Cherry, Bitter Cherry, Choke Cherry, and Pin Cherry Prunus spp. 
Wisteria Wisteria spp. 
Yellow Star Thistle Centaurea solstitialis 
Yew Taxus cuspidata 

 Indiana Plants Poisonous to Livestock and Pets

 University of Illinois Plants Poisonous to Animals

 University of Pennsylvania School of Veterinary Medicine Poisonous Plants Directory

Canadian Poisonous Plants Information System

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