Plant Toxicity
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Here is a list of commonly encountered toxic plants and their general level of toxicity. Many plants on this list are considered by some as edible or medicinal when prepared properly, but are included due to their potential to be toxic or cause irritation. This is by no means a complete list, and reactions to many plants can vary drastically from one individual to another. In addition, toxicity can vary due to several factors such as climate, variety, or subspecies. If there is ever any question on the toxicity of any plant, it should be assumed to be toxic. If you or someone you know has ingested a plant that could be toxic, call the National Poison Control Center Hotline at 1-800-222-1222, use their quick online tool, or seek medical advise.
Common name |
Scientific name |
Toxicity |
| Achillea | Achillea millefolium | Mildly Toxic, Skin Irritant |
| Aconite | Aconitum spp. | Highly Toxic |
| African boxwood | Myrsine africana | Mildly Toxic |
| African lily | Agapanthus spp. | Mildly Toxic, Skin Irritant |
| Agapanthus | Agapanthus spp. | Mildly Toxic, Skin Irritant |
| Agave or century plant | Agave spp. | Mildly Toxic, Contains Oxalates, Skin Irritant |
| Aglaonema | Aglaonema spp. | Contains Oxalates, Skin Irritant |
| Ailanthus | Ailanthus altissima | Mildly Toxic, Skin Irritant |
| Alder | Alnus spp. | Skin Irritant |
| Allium (onions, garlic, chives, and leeks) | Allium spp. | Mildly Toxic |
| Almond (seeds) | Prunus spp. | Highly Toxic |
| Alocasia | Alocasia spp. | Contains Oxalates, Skin Irritant |
| Alstroemeria | Alstroemeria spp. | Mildly Toxic, Skin Irritant |
| Amaranth | Amaranthus spp. | Highly Toxic |
| Amaryllis | Amaryllis belladonna | Mildly Toxic, Skin Irritant |
| Amaryllis | Hippeastrum spp. | Mildly Toxic |
| Anemone | Anemone spp. | Mildly Toxic, Skin Irritant |
| Angel's trumpet | Brugmansia spp. | Highly Toxic |
| Anthurium | Anthurium spp. | Contains Oxalates, Skin Irritant |
| Apple (seeds) | Malus spp. | Highly Toxic |
| Apricot (seeds) | Prunus spp. | Highly Toxic |
| Aralia, Ming | Polyscias spp. | Mildly Toxic, Skin Irritant |
| Arborvitae | Thuja spp. | Mildly Toxic, Skin Irritant |
| Arum | Arum spp. | Contains Oxalates, Skin Irritant |
| Ash | Fraxinus spp. | Skin Irritant |
| Asparagus, Garden | Asparagus officinalis | Skin Irritant |
| Asparagus, Sprenger | Asparagus densiflorus | Skin Irritant |
| Aster | Aster spp. | Skin Irritant |
| Aucuba, Japanese | Aucuba japonica | Mildly Toxic |
| Autumn crocus | Colchicum autumnale | Highly Toxic, Skin Irritant |
| Azalea | Rhododendron spp. | Highly Toxic |
| Baby's breath | Gypsophila paniculata | Skin Irritant |
| Balsam fir | Abies balsamea | Skin Irritant |
| Barberry | Berberis spp. | Mildly Toxic, Skin Irritant |
| Begonia | Begonia spp. (some spp.) | Mildly Toxic, Contains Oxalates |
| Belladonna | Atropa belladonna | Highly Toxic |
| Belladonna lily | Amaryllis belladonna | Mildly Toxic, Skin Irritant |
| Bermudagrass | Cynodon dactylon | Skin Irritant |
| Birch tree | Betula spp. | Mildly Toxic, Skin Irritant |
| Bird-of-paradise shrub | Caesalpina gilliesii | Mildly Toxic |
| Bishop's weed | Ammi majus | Skin Irritant |
| Bittersweet | Celastrus scandens | Mildly Toxic |
| Black calla | Arum spp. | Contains Oxalates, Skin Irritant |
| Black cherry (seeds) | Prunus spp. | Highly Toxic |
| Black henbane | Hyoscyamus niger | Highly Toxic |
| Black locust (seeds) | Robinia pseudoacacia | Highly Toxic |
| Black nightshade | Solanum spp. | Highly Toxic |
| Blanket flower | Gaillardia spp. | Skin Irritant |
| Bleeding heart | Dicentra spp. | Skin Irritant |
| Blood lily | Haemanthus spp. | Mildly Toxic, Skin Irritant |
| Blue Gum | Eucalyptus spp. | Mildly Toxic, Skin Irritant |
| Boston ivy | Parthenocissus spp. | Contains Oxalates, Skin Irritant |
| Bottle tree | Brachychiton populneus | Skin Irritant |
| Boxwood | Buxus sempervirens | Mildly Toxic, Skin Irritant |
| Brazilian pepper tree | Schinus terebinthifolius | Mildly Toxic, Skin Irritant |
| Buckeye | Aesculus spp. | Mildly Toxic |
| Buckthorn (seaberry) | Rhamnus spp. | Mildly Toxic, Skin Irritant |
| Burning bush | Euonymus spp. | Mildly Toxic |
| Bushman's poison | Acokanthera spp. | Highly Toxic |
| Buttercup | Ranunculus spp. | Mildly Toxic, Skin Irritant |
| Cajeput tree | Melaleuca quinquenervia | Skin Irritant |
| Caladium | Caladium bicolor | Contains Oxalates, Skin Irritant |
| California bay | Umbellularia californica | Skin Irritant |
| California buckeye | Aesculus spp. | Mildly Toxic |
| California laurel | Umbellularia californica | Skin Irritant |
| California pepper tree | Schinus molle | Skin Irritant |
| Calla lily | Zantedeschia aethiopica | Contains Oxalates, Skin Irritant |
| Calla, Black | Arum spp. | Contains Oxalates, Skin Irritant |
| Camphor tree | Cinnamomum camphora | Mildly Toxic |
| Candytuft, Evergreen | Iberis sempervirens | Skin Irritant |
| Cape plumbago | Plumbago auriculata | Skin Irritant |
| Cardinal flower | Lobelia spp. | Highly Toxic, Skin Irritant |
| Carnation | Dianthus caryophyllus | Mildly Toxic, Skin Irritant |
| Carolina jessamine | Gelsemium sempervirens | Highly Toxic, Skin Irritant |
| Carolina laurel cherry | Prunus caroliniana | Highly Toxic |
| Castor bean | Ricinus communis | Highly Toxic |
| Cestrum | Cestrum spp. | Highly Toxic |
| Chamomile | Chamaemelum spp. | Skin Irritant |
| Checkered lily | Fritillaria meleagris | Highly Toxic |
| Chenille plant | Acalypha spp. | Mildly Toxic, Skin Irritant |
| Cherry (seeds) | Prunus spp. | Highly Toxic |
| Chinaberry | Melia azedarach | Highly Toxic |
| Chinese evergreen | Aglaonema spp. | Contains Oxalates, Skin Irritant |
| Chinese lantern | Physalis spp. | Highly Toxic |
| Chinese tallow tree | Sapium sebiferum | Skin Irritant |
| Chokecherry | Prunus virginiana | Highly Toxic |
| Christmas rose | Helleborus spp. | Highly Toxic, Skin Irritant |
| Chrysanthemum | Chrysanthemum spp. | Mildly Toxic, Skin Irritant |
| Cineraria | Senecio hybridus | Mildly Toxic, Skin Irritant |
| Clematis | Clematis spp. | Mildly Toxic, Skin Irritant |
| Climbing lily | Gloriosa spp. | Highly Toxic |
| Clivia | Clivia spp. | Mildly Toxic, Skin Irritant |
| Coast redwood | Sequoia sempervirens | Mildly Toxic, Skin Irritant |
| Coffee plant | Coffea arabica | Mildly Toxic |
| Coffeeberry | Rhamnus spp. | Mildly Toxic, Skin Irritant |
| Columbine | Aquilegia spp. | Mildly Toxic |
| Copperleaf | Acalypha spp. | Mildly Toxic, Skin Irritant |
| Coral plant | Jatropha spp. | Mildly Toxic, Skin Irritant |
| Coral tree | Erythrina spp. | Highly Toxic |
| Coralberry | Symphoricarpos spp. | Mildly Toxic |
| Cotoneaster | Cotoneaster spp. | Mildly Toxic |
| Crabapple (seeds) | Malus spp. | Highly Toxic |
| Creeping Charlie | Glechoma hederacea | Mildly Toxic |
| Crinum lily | Crinum spp. | Mildly Toxic, Skin Irritant |
| Crocus, Autumn | Colchicum autumnale | Highly Toxic, Skin Irritant |
| Croton | Codiaeum variegatum | Mildly Toxic, Skin Irritant |
| Crown of thorns | Euphorbia spp. | Mildly Toxic, Skin Irritant |
| Cyclamen | Cyclamen spp. | Mildly Toxic, Skin Irritant |
| Daffodil (bulb) | Narcissus spp. | Mildly Toxic, Skin Irritant |
| Daisy | Chrysanthemum spp. | Mildly Toxic, Skin Irritant |
| Daphne | Daphne spp. | Highly Toxic |
| Deadly nightshade | Atropa belladonna | Highly Toxic |
| Deadly nightshade | Hyoscyamus niger | Highly Toxic |
| Deadly nightshade | Solanum spp. | Highly Toxic |
| Death camas | Zigadenus spp. | Highly Toxic |
| Delphinium | Delphinium spp. | Highly Toxic |
| Desert bluebells | Phacelia spp. | Skin Irritant |
| Dichondra | Dichondra micrantha | Skin Irritant |
| Dieffenbachia | Dieffenbachia spp. | Contains Oxalates |
| Dogwood | Cornus spp. | Skin Irritant |
| Dumb cane | Dieffenbachia spp. | Contains Oxalates |
| Dusty miller | Senecio spp. (some spp.) | Mildly Toxic, Skin Irritant |
| Dutch iris | Iris spp. | Mildly Toxic, Skin Irritant |
| Echium | Echium vulgare | Highly Toxic, Skin Irritant |
| Elderberry (ripe fruit is nontoxic) | Sambucus spp. | Highly Toxic |
| Elephant's ear | Alocasia spp. | Contains Oxalates, Skin Irritant |
| Elephant's ear | Colocasia spp. | Contains Oxalates, Skin Irritant |
| Elephant's ear | Xanthosoma spp. | Contains Oxalates, Skin Irritant |
| Elm tree | Ulmus spp. | Skin Irritant |
| English daisy | Bellis perennis | Skin Irritant |
| English ivy | Hedera spp. | Mildly Toxic, Skin Irritant |
| English laurel | Prunus laurocerasus | Highly Toxic |
| English yew (seeds) | Taxus baccata | Highly Toxic |
| Eucalyptus | Eucalyptus spp. | Mildly Toxic, Skin Irritant |
| Euonymus | Euonymus spp. | Mildly Toxic |
| Euphorbia | Euphorbia spp. | Mildly Toxic, Skin Irritant |
| European mistletoe | Viscum album | Highly Toxic |
| Evergreen candytuft | Iberis sempervirens | Skin Irritant |
| False heather | Cuphea hyssopifolia | Skin Irritant |
| False Queen Anne's lace | Ammi majus | Skin Irritant |
| Fescue (grass) | Festuca spp. | Skin Irritant |
| Fiddle-leaf fig | Ficus lyrata | Skin Irritant |
| Fig | Ficus carica and Ficus spp. | Skin Irritant |
| Fig, Fiddle-leaf | Ficus lyrata | Skin Irritant |
| Fig, Weeping | Ficus spp. | Skin Irritant |
| Fir, Balsam | Abies balsamea | Skin Irritant |
| Firetail | Acalypha spp. | Mildly Toxic, Skin Irritant |
| Firethorn | Pyracantha spp. | Mildly Toxic, Skin Irritant |
| Fishtail palm | Caryota spp. | Contains Oxalates, Skin Irritant |
| Flax | Linum usitatissimum | Skin Irritant |
| Fleabane | Erigeron spp. | Skin Irritant |
| Flowering tobacco | Nicotiana glauca | Highly Toxic |
| Four-o'clock | Mirabilis jalapa | Mildly Toxic, Skin Irritant |
| Foxglove | Digitalis purpurea | Highly Toxic |
| Frangipani | Plumeria rubra | Skin Irritant |
| Ginkgo | Ginkgo biloba | Skin Irritant |
| Gladiolus | Gladiolus spp. | Mildly Toxic, Skin Irritant |
| Glory lily | Gloriosa spp. | Highly Toxic |
| Goldenchain tree | Laburnum anagyroides | Mildly Toxic |
| Gopher plant | Euphorbia spp. | Mildly Toxic, Skin Irritant |
| Grape ivy | Cissus rhombifolia | Skin Irritant |
| Grevillea | Grevillea spp. | Skin Irritant |
| Ground ivy | Glechoma hederacea | Mildly Toxic |
| Groundcherry | Physalis spp. | Highly Toxic |
| Guernsey lily | Nerine spp. | Mildly Toxic, Skin Irritant |
| Gum | Eucalyptus spp. | Mildly Toxic, Skin Irritant |
| Heart leaf | Philodendron spp. | Contains Oxalates, Skin Irritant |
| Heather | Calluna vulgaris | Highly Toxic |
| Heliotrope | Heliotropum arborescens | Highly Toxic |
| Hellebore | Helleborus spp. | Highly Toxic, Skin Irritant |
| Hemlock, Poison | Conium maculatum | Highly Toxic |
| Hemlock, Water | Cicuta spp. | Highly Toxic |
| Henbane, Black | Hyoscyamus niger | Highly Toxic |
| Holly (berries) | Ilex spp. | Mildly Toxic |
| Hollyhock | Alcea rosea | Skin Irritant |
| Honey bush | Melianthus spp. | Highly Toxic |
| Horsechestnut | Aesculus spp. | Mildly Toxic |
| Hyacinth | Hyacinthus orientalis | Mildly Toxic, Skin Irritant |
| Hydrangea | Hydrangea spp. | Highly Toxic, Skin Irritant |
| Iceland poppy | Papaver nudicaule | Contains Oxalates, Skin Irritant |
| Indian currant | Symphoricarpos spp. | Mildly Toxic |
| Indian turnip | Arisaema triphyllum | Contains Oxalates, Skin Irritant |
| Iris | Iris spp. | Mildly Toxic, Skin Irritant |
| Italian arum | Arum spp. | Contains Oxalates, Skin Irritant |
| Ivy | Hedera spp. | Mildly Toxic, Skin Irritant |
| Ivy, Boston | Parthenocissus spp. | Contains Oxalates, Skin Irritant |
| Ivy, English | Hedera spp. | Mildly Toxic, Skin Irritant |
| Ivy, Grape | Cissus rhombifolia | Skin Irritant |
| Ivy, Ground | Glechoma hederacea | Mildly Toxic |
| Jack-in-the-pulpit | Arisaema triphyllum | Contains Oxalates, Skin Irritant |
| Jade plant | Crassula argentea | Mildly Toxic, Skin Irritant |
| Japanese aucuba | Aucuba japonica | Mildly Toxic |
| Japanese pieris | Pieris japonica | Highly Toxic |
| Japanese yew (seeds) | Taxus spp. | Highly Toxic |
| Jatropha | Jatropha spp. | Mildly Toxic, Skin Irritant |
| Jequirity bean | Abrus precatorius | Highly Toxic |
| Jerusalem cherry | Solanum pseudocapsicum | Highly Toxic |
| Jessamine | Cestrum spp. | Highly Toxic |
| Jessamine, Carolina | Gelsemium sempervirens | Highly Toxic, Skin Irritant |
| Jimson weed | Brugmansia spp. | Highly Toxic |
| Jonquil (bulb) | Narcissus spp. | Mildly Toxic, Skin Irritant |
| Juniper | Juniperus spp. | Mildly Toxic |
| Kaffir lily | Clivia spp. | Mildly Toxic, Skin Irritant |
| Laburnum | Laburnum anagyroides | Mildly Toxic |
| Lady slipper orchid | Cypripedium spp. | Skin Irritant |
| Lantana | Lantana camara | Highly Toxic |
| Larkspur | Delphinium spp. | Highly Toxic |
| Laurel cherry | Prunus caroliniana | Highly Toxic |
| Laurel, California | Umbellularia californica | Skin Irritant |
| Laurel, English | Prunus laurocerasus | Highly Toxic |
| Laurel, Mountain | Kalmia latifolia | Mildly Toxic |
| Laurel, New Zealand | Corynocarpus laevigata | Mildly Toxic |
| Lenten rose | Helleborus spp. | Highly Toxic, Skin Irritant |
| Ligustrum | Ligustrum spp. | Mildly Toxic, Skin Irritant |
| Lily | Lilium spp. (some spp.) | Mildly Toxic, Skin Irritant |
| Lily, African | Agapanthus spp. | Mildly Toxic, Skin Irritant |
| Lily, Belladonna | Amaryllis belladonna | Mildly Toxic, Skin Irritant |
| Lily, Blood | Haemanthus spp. | Mildly Toxic, Skin Irritant |
| Lily, Calla | Zantedeschia aethiopica | Contains Oxalates, Skin Irritant |
| Lily, Checkered | Fritillaria meleagris | Highly Toxic |
| Lily, Climbing | Gloriosa spp. | Highly Toxic |
| Lily, Crinum | Crinum spp. | Mildly Toxic, Skin Irritant |
| Lily, Glory | Gloriosa spp. | Highly Toxic |
| Lily, Guernsey | Nerine spp. | Mildly Toxic, Skin Irritant |
| Lily, Kaffir | Clivia spp. | Mildly Toxic, Skin Irritant |
| Lily, Peruvian | Alstroemeria spp. | Mildly Toxic, Skin Irritant |
| Lily, Spider | Lycoris spp. | Mildly Toxic |
| Lily, Spider | Hymenocallis spp. | Mildly Toxic, Skin Irritant |
| Lily-of-the-Nile | Agapanthus spp. | Mildly Toxic, Skin Irritant |
| Lily-of-the-valley | Convallaria majalis | Highly Toxic, Skin Irritant |
| Lobelia | Lobelia spp. | Highly Toxic, Skin Irritant |
| Locust, Black (seeds) | Robinia pseudoacacia | Highly Toxic |
| Loquat (seeds) | Eriobotrya japonica | Highly Toxic |
| Love-in-a-mist | Nigella damascena | Mildly Toxic |
| Lupine | Lupinus spp. | Highly Toxic |
| Maidenhair tree | Ginkgo biloba | Skin Irritant |
| Maple | Acer spp. | Skin Irritant |
| Marigold | Tagetes spp. | Skin Irritant |
| Marsh marigold | Caltha palustris | Mildly Toxic |
| May apple | Podophyllum peltatum | Highly Toxic |
| Meadow saffron | Colchicum autumnale | Highly Toxic, Skin Irritant |
| Milkweed or Butterfly Weed | Asclepias spp. | Mildly Toxic, Skin Irritant |
| Ming aralia | Polyscias spp. | Mildly Toxic, Skin Irritant |
| Mistletoe | Phoradendron spp. | Mildly Toxic, Skin Irritant |
| Mistletoe, European | Viscum album | Highly Toxic |
| Monkshood | Aconitum spp. | Highly Toxic |
| Morning glory (seeds) | Ipomoea spp. | Highly Toxic |
| Moses-in-the-cradle | Rhoeo spathacea | Skin Irritant |
| Mountain laurel | Kalmia latifolia | Mildly Toxic |
| Myoporum | Myoporum laetum | Highly Toxic |
| Myrtle | Myrtus communis | Mildly Toxic |
| Myrtle | Vinca spp. | Highly Toxic |
| Naked lady | Amaryllis belladonna | Mildly Toxic, Skin Irritant |
| Narcissus (bulb) | Narcissus spp. | Mildly Toxic, Skin Irritant |
| Natal plum | Carissa macrocarpa | Mildly Toxic |
| Nectarine (seeds) | Prunus spp. | Highly Toxic |
| Nephthytis | Syngonium podophyllum | Contains Oxalates |
| Nerine | Nerine spp. | Mildly Toxic, Skin Irritant |
| Nettles, Stinging | Urtica spp. | Skin Irritant |
| New Zealand laurel | Corynocarpus laevigata | Mildly Toxic |
| Night-blooming jessamine | Cestrum spp. | Highly Toxic |
| Nightshade | Solanum spp. | Highly Toxic |
| Nightshade, Deadly | Atropa belladonna | Highly Toxic |
| Nightshade, Deadly | Hyoscyamus niger | Highly Toxic |
| Oak tree (acorns) | Quercus spp. | Mildly Toxic, Skin Irritant |
| Oleander | Nerium oleander | Highly Toxic, Skin Irritant |
| Oleander, Yellow | Thevetia peruviana | Highly Toxic, Skin Irritant |
| Ornithogalum | Ornithogalum spp. | Highly Toxic |
| Pampas grass | Cortaderia selloana | Highly Toxic |
| Pansy or Violet (seeds) | Viola spp. | Mildly Toxic |
| Pasque flower | Anemone spp. | Mildly Toxic, Skin Irritant |
| Peach (seeds) | Prunus spp. | Highly Toxic |
| Pear (seeds) | Pyrus spp. | Highly Toxic |
| Pencil tree | Euphorbia spp. | Mildly Toxic, Skin Irritant |
| Pepper tree, Brazilian | Schinus terebinthifolius | Mildly Toxic, Skin Irritant |
| Pepper tree, California | Schinus molle | Skin Irritant |
| Periwinkle | Vinca spp. | Highly Toxic |
| Peruvian lily | Alstroemeria spp. | Mildly Toxic, Skin Irritant |
| Peruvian scilla | Scilla spp. | Highly Toxic |
| Philodendron | Philodendron spp. | Contains Oxalates, Skin Irritant |
| Philodendron, Split-leaf | Monstera deliciosa | Contains Oxalates, Skin Irritant |
| Pieris, Japanese | Pieris japonica | Highly Toxic |
| Pineapple | Ananas comosus | Skin Irritant |
| Pink | Dianthus spp. | Mildly Toxic, Skin Irritant |
| Pittosporum | Pittosporum spp. | Highly Toxic |
| Plum (seeds) | Prunus spp. | Highly Toxic |
| Plumbago, Cape | Plumbago auriculata | Skin Irritant |
| Plumeria | Plumeria rubra | Skin Irritant |
| Poinciana | Caesalpina gilliesii | Mildly Toxic |
| Poinsettia | Euphorbia spp. | Mildly Toxic, Skin Irritant |
| Poison hemlock | Conium maculatum | Highly Toxic |
| Poison oak | Toxicodendron diversilobum | Skin Irritant |
| Pokeweed | Phytolacca americana | Mildly Toxic |
| Poppy | Papaver spp. | Mildly Toxic, Skin Irritant |
| Poppy, Iceland | Papaver nudicaule | Contains Oxalates, Skin Irritant |
| Potato plant (green parts) | Solanum tuberosum | Highly Toxic |
| Pothos | Epipremnum aureum | Contains Oxalates, Skin Irritant |
| Pregnant onion | Ornithogalum spp. | Highly Toxic |
| Primrose | Primula spp. | Skin Irritant |
| Primula | Primula spp. | Skin Irritant |
| Privet | Ligustrum spp. | Mildly Toxic, Skin Irritant |
| Pyracantha | Pyracantha spp. | Mildly Toxic, Skin Irritant |
| Queen Anne's lace | Daucus carota | Skin Irritant |
| Queen Anne's lace, False | Ammi majus | Skin Irritant |
| Ranunculus | Ranunculus spp. | Mildly Toxic, Skin Irritant |
| Redwood, Coast | Sequoia sempervirens | Mildly Toxic, Skin Irritant |
| Rhododendron | Rhododendron spp. | Highly Toxic |
| Rhubarb (leaves) | Rheum rhabarbarum | Contains Oxalates |
| Rosary bean | Abrus precatorius | Highly Toxic |
| Rosary pea | Abrus precatorius | Highly Toxic |
| Rubber plant | Ficus elastica | Skin Irritant |
| Rue | Ruta graveolens | Skin Irritant |
| Sagebrush | Artemisia spp. | Skin Irritant |
| Sago palm | Cycas revoluta | Mildly Toxic |
| Scarlet pimpernel | Anagallis arvensis | Mildly Toxic, Skin Irritant |
| Schefflera | Schefflera actinophylla | Mildly Toxic, Skin Irritant |
| Scotch broom | Cytisus spp. | Mildly Toxic |
| Shasta daisy | Chrysanthemum maximum | Mildly Toxic, Skin Irritant |
| Silk oak | Grevillea spp. | Skin Irritant |
| Skunk cabbage | Veratrum spp. | Mildly Toxic |
| Smoke bush | Cotinus coggygria | Skin Irritant |
| Snake plant | Sansevieria spp. | Mildly Toxic, Skin Irritant |
| Snakeshead | Fritillaria meleagris | Highly Toxic |
| Snowberry | Symphoricarpos spp. | Mildly Toxic |
| Snowdrop | Galanthus spp. | Mildly Toxic, Skin Irritant |
| Snowflake | Leucojum spp. | Mildly Toxic, Skin Irritant |
| Snow-on-the-mountain | Euphorbia spp. | Mildly Toxic, Skin Irritant |
| Spathiphyllum | Spathiphyllum spp. | Contains Oxalates, Skin Irritant |
| Spider lily | Lycoris spp. | Mildly Toxic |
| Spider lily | Hymenocallis spp. | Mildly Toxic, Skin Irritant |
| Split-leaf philodendron | Monstera deliciosa | Contains Oxalates, Skin Irritant |
| Sprenger asparagus | Asparagus densiflorus | Skin Irritant |
| Squill | Scilla spp. | Highly Toxic |
| St. Johnswort | Hypericum calycinum | Highly Toxic, Skin Irritant |
| Star-of-Bethelehem | Ornithogalum spp. | Highly Toxic |
| Stinging nettles | Urtica spp. | Skin Irritant |
| String of beads | Senecio spp. (some spp.) | Mildly Toxic, Skin Irritant |
| Sweet pea (seeds) | Lathyrus odoratus | Mildly Toxic |
| Sweet William | Dianthus barbatus | Mildly Toxic, Skin Irritant |
| Tansy | Tanacetum spp. | Skin Irritant |
| Taro | Colocasia esculenta | Contains Oxalates, Skin Irritant |
| Tomato (non-fruit parts) | Solanum lycopersicum | Highly Toxic, Skin Irritant |
| Toyon | Heteromeles arbutifolia | Highly Toxic |
| Tree tobacco | Nicotiana glauca | Highly Toxic |
| Tree-of-heaven | Ailanthus altissima | Mildly Toxic, Skin Irritant |
| Trumpet creeper | Campsis radicans | Skin Irritant |
| Trumpet vine | Campsis radicans | Skin Irritant |
| Tuberose | Polianthes tuberosa | Mildly Toxic |
| Tulip (bulb) | Tulipa spp. | Mildly Toxic, Skin Irritant |
| Umbrella plant | Cyperus alternifolius | Mildly Toxic |
| Umbrella tree | Schefflera actinophylla | Mildly Toxic, Skin Irritant |
| Vinca | Vinca spp. | Highly Toxic |
| Virginia creeper | Parthenocissus spp. | Contains Oxalates, Skin Irritant |
| Walnut | Juglans spp. | Skin Irritant |
| Wandering jew | Tradescantia spp. | Skin Irritant |
| Water hemlock | Cicuta spp. | Highly Toxic |
| Weeping fig | Ficus spp. | Skin Irritant |
| Windflower | Anemone spp. | Mildly Toxic, Skin Irritant |
| Wintersweet | Acokanthera spp. | Highly Toxic |
| Wisteria | Wisteria spp. | Mildly Toxic |
| Wormwood | Artemisia spp. | Skin Irritant |
| Yarrow | Achillea millefolium | Mildly Toxic, Skin Irritant |
| Yew pine | Podocarpus macrophyllus | Mildly Toxic |
| Yew, English (seeds) | Taxus baccata | Highly Toxic |
| Yew, Japanese (seeds) | Taxus spp. | Highly Toxic |