Last updated: 31 March 2024
Introduction
Creating a dog friendly home means knowing which plants to keep around and which ones to avoid. As we all know, dogs and especially puppies sometimes nibble on things they shouldn’t. While many plants are perfectly safe for dogs, other plants (even unexpected ones like Daffodils and Rhubarb) can be toxic to our furry friends.
Whether your back garden is a plant oasis, you love to bring nature inside your home, or even if you’re just walking your dog in the local park, it’s crucial to be aware of plants that may be unsafe for your pooch.
Our Comprehensive Guide of 400+ Toxic Plants To Dogs
Our easy-to-follow guide outlines 400+ plants that could be harmful to you your dog, including:
- The common and scientific names of each plant, for easy identification.
- The poisonous compound in the plant.
- The potential symptoms your dog could experience.
| Plant Name | Scientific Name | Poisonous Compound | Symptoms |
|---|---|---|---|
| Adam-and-Eve | Arum maculatum | Calcium oxalate crystals | Oral irritation, swelling, difficulty swallowing. |
| African Tulip Tree | Spathodea campanulata | Toxins unknown | Mild to severe gastrointestinal upset |
| African Tulip Tree | Spathodea campanulata | Toxins unknown | Mild to severe gastrointestinal upset |
| African Wonder Tree | Ricinus communis | Ricin | Severe abdominal pain, vomiting, diarrhea, seizures. |
| Alocasia | Alocasia spp. | Calcium oxalate crystals | Oral irritation, swelling of mouth and throat, difficulty breathing |
| Aloe | Aloe vera | Anthraquinones | Vomiting, diarrhea, lethargy. |
| Amaryllis | Amaryllis spp. | Lycorine | Vomiting, depression |
| Ambrosia Mexicana | Chenopodium botrys | Unknown | Potential gastrointestinal upset. |
| American Bittersweet | Celastrus scandens | Triterpenoid saponins | Vomiting, diarrhea, weakness. |
| American Holly | Ilex opaca | Saponins | Vomiting, diarrhea, depression. |
| American Mandrake | Podophyllum peltatum | Podophyllotoxin | Vomiting, diarrhea, lethargy. |
| American Yew | Taxus canadensus | Taxine | Vomiting, difficulty breathing, heart failure. |
| Andromeda Japonica | Pieris japonica | Grayanotoxins | Vomiting, diarrhea, cardiovascular collapse. |
| Angel’s Trumpet | Brugmansia spp. | Tropane alkaloids | Visual and auditory hallucinations, increased heart rate |
| Angelica Tree | Aralia spinosa | Saponins | Vomiting, diarrhea. |
| Apple | Malus sylvestrus | Cyanogenic glycosides (in seeds) | Vomiting, diarrhea, abdominal pain, potential cyanide poisoning. |
| Apricot | Prunus armeniaca | Cyanogenic glycosides (in kernels) | Respiratory failure, shock, potentially fatal if ingested in large quantities. |
| Arrowhead Plant | Syngonium podophyllum | Calcium oxalate crystals | Oral irritation, pain and swelling of mouth, tongue, lips |
| Arum | Arum maculatum | Calcium oxalate crystals | Oral irritation, swelling, difficulty breathing. |
| Arum Lily | Zantedeschia aethiopica | Calcium oxalate crystals | Swelling of the oral area, difficulty swallowing, vomiting. |
| Asparagus Fern | Asparagus setaceus | Sapogenin | Allergic dermatitis, vomiting, diarrhea |
| Australian Ivy Palm | Brassaia actinophylla | Calcium oxalate crystals | Mouth irritation, vomiting, difficulty swallowing. |
| Australian Nut | Macadamia integrifolia | Unknown | Weakness, depression, vomiting, hyperthermia. |
| Autumn Crocus | Colchicum autumnale | Colchicine | Gastrointestinal bleeding, liver damage |
| Azalea | Rhododendron spp. | Grayanotoxins | Vomiting, weakness, cardiac failure |
| Baby Doll Ti Plant | Cordyline terminalis | Saponins | Vomiting, drooling. |
| Barbados Aloe | Aloe barbadensis | Anthraquinones | Vomiting, diarrhea, lethargy. |
| Barbados Lily | Hippeastrum spp. | Lycorine | Vomiting, diarrhea. |
| Barbados Pride | Caesalpinia pulcherrima | Tannins, toxic alkaloids | Vomiting, diarrhea. |
| Bay Laurel | Laurus nobilis | Essential oils | Vomiting, diarrhea, potential for central nervous system depression. |
| Bead Tree | Melia azedarach | Tetranortriterpenes | Vomiting, seizures, potentially fatal. |
| Begonia | Begonia spp. | Oxalate crystals, soluble calcium oxalates | Oral irritation, difficulty swallowing, vomiting |
| Bergamot Orange | Citrus Aurantium | Essential oils, psoralens | Vomiting, diarrhea, photosensitivity. |
| Bird of Paradise | Caesalpinia gilliesii | Tannins, hydrocyanic acid | Nausea, vomiting, drowsiness. |
| Bird’s Tongue Flower | Strelitzia reginae | Not specifically toxic | Mild gastrointestinal upset if ingested. |
| Bishop’s Weed | Ammi majus | Furanocoumarins | Dermatitis, photosensitivity. |
| Bitter Root | Apocynum androsaemifolium | Cardiac glycosides | Vomiting, diarrhea, cardiac arrhythmia. |
| Black Calla | Arum palestinum | Calcium oxalate crystals | Oral irritation, swelling, difficulty swallowing. |
| Black Cherry | Prunus serotina | Cyanogenic glycosides | Gastrointestinal upset, potential cyanide poisoning from pits. |
| Black Laurel | Leucothoe spp. | Grayanotoxins | Vomiting, depression, cardiovascular collapse. |
| Black Nightshade | Solanum nigrum | Solanine, tropane alkaloids | Salivation, vomiting, drowsiness, abdominal pain. |
| Black Walnut | Juglans nigra | Juglone | Mild gastrointestinal upset, risk of laminitis in horses. |
| Bobbins | Arum maculatum | Calcium oxalate crystals | Oral irritation, swelling, difficulty in breathing. |
| Bog Laurel | Kalmia poliifolia | Grayanotoxins | Vomiting, diarrhea, depression. |
| Borage | Borage officinalis | Pyrolizidine alkaloids | Liver damage, lung issues with prolonged use. |
| Boxwood | Buxus spp. | Alkaloids | Vomiting, diarrhea, respiratory failure. |
| Branching Ivy | Hedera helix | Triterpenoid saponins | Vomiting, abdominal pain, hypersalivation. |
| Brazilwood | Poinciana gilliesii | Tannins, hydrocyanic acid | Nausea, vomiting, drowsiness. |
| Bread and Butter Plant | Coleus ampoinicus | Essential oils, diterpenes | Gastrointestinal upset, skin irritation. |
| Brunfelsia | Brunfelsia spp. | Brunfelsamidine, other alkaloids | Muscle tremors, seizures, vomiting |
| Buckeye | Aesculus spp | Glycosides | Vomiting, diarrhea, depression. |
| Buckwheat | Fagopyrum spp. | Fagopyrin | Photosensitivity, contact dermatitis. |
| Buddhist Pine | Podocarpus macrophylla | Unknown | Vomiting, diarrhea. |
| Burning Bush | Euonymus atropurpurea | Alkaloids | Nausea, vomiting, weakness, heart problems. |
| Buttercup | Ranunculus spp. | Protoanemonin | Drooling, vomiting, diarrhea. |
| Butterfly Iris | Iris spuria | Iridoid glycosides | Gastrointestinal upset, salivation. |
| Caladium | Caladium spp. | Calcium oxalate crystals | Mouth and throat irritation, difficulty swallowing |
| Calamondin Orange | Citrus mitis | Essential oils, psoralens | Vomiting, diarrhea, potential photosensitivity. |
| California Ivy | Hedera helix | Triterpenoid saponins | Vomiting, abdominal pain, hypersalivation. |
| Calla Lily | Zantedeschia aethiopica | Calcium oxalate crystals | Oral irritation, burning sensation of lips, tongue, and throat, difficulty swallowing |
| Cape Jasmine | Gardenia jasminoides | Genipin, gardenoside | Mild vomiting, diarrhea. |
| Caraway | Carum carvi | Essential oils | Gastrointestinal upset in large amounts. |
| Cardboard Cycad | Zamia furfuracea | Cycasin | Liver failure, vomiting, seizures. |
| Cardboard Palm | Zamia spp. | Cycasin | Liver failure, seizures. |
| Cardinal Flower | Lobelia cardinalis | Lobeline | Vomiting, diarrhea, excessive salivation. |
| Carnation | Dianthus caryophyllus | Unknown | Mild gastrointestinal upset, skin rash. |
| Castor Bean | Ricinus communis | Ricin | Severe abdominal pain, dehydration |
| Ceriman | Monstera deliciosa | Calcium oxalate crystals | Oral irritation, swelling, vomiting. |
| Chamomile | Anthemis nobilis | Sesquiterpene lactones | Dermatitis, gastrointestinal upset, nervous system depression. |
| Chandelier Plant | Kalanchoe tubiflora | Bufadienolides | Vomiting, diarrhea, heart abnormalities. |
| Charming Dieffenbachia | Dieffenbachia amoena | Calcium oxalate crystals | Oral irritation, excessive drooling, difficulty swallowing. |
| Cherry | Prunus spp. | Cyanogenic glycosides | Gastrointestinal upset, potential cyanide poisoning from pits. |
| Chinaberry Tree | Melia azedarach | Tetranortriterpenes | Vomiting, seizures, potentially fatal. |
| Chinese Evergreen | Aglaonema modestum | Calcium oxalate crystals | Mouth irritation, swelling, difficulty breathing. |
| Chinese Jade | Crassula arborescens | Unknown | Mild vomiting, lethargy. |
| Chives | Allium schoenoprasum | Organosulfides | Gastrointestinal upset, potential for hemolytic anemia. |
| Choke Cherry | Prunus virginiana | Cyanogenic glycosides | Respiratory distress, spasms, potentially fatal. |
| Christmas Rose | Helleborus niger | Protoanemonin | Abdominal pain, vomiting, diarrhea. |
| Chrysanthemum | Chrysanthemum spp. | Pyrethrins | Gastrointestinal upset, drooling |
| Clematis | Clematis spp. | Protoanemonin | Vomiting, diarrhea, drooling. |
| Climbing Bittersweet | Celastrus scandens | Triterpenoid saponins | Vomiting, diarrhea, weakness. |
| Climbing Lily | Gloriosa superba | Colchicine | Oral irritation, diarrhea, organ damage. |
| Climbing Nightshade | Solanum dulcamara | Solanine | Vomiting, diarrhea, drowsiness. |
| Clivia Lily | Clivia spp. | Lycorine | Mild vomiting, diarrhea. |
| Clusia Rosea | Clusia major | Unknown | Limited information; potential gastrointestinal upset. |
| Coffee Tree | Polyscias guilfoylei | Not specifically toxic | Mild, if any, symptoms reported. |
| Coleus | Coleus spp. | Essential oils, diterpenes | Vomiting, diarrhea, depression, anorexia |
| Common Privet | Ligustrum vulgare | Glycosides | Vomiting, diarrhea, rapid heart rate. |
| Coontie Palm | Zamia pumila | Cycasin | Liver failure, vomiting, seizures. |
| Cordatum | Philodendron oxycardium | Calcium oxalate crystals | Oral irritation, difficulty swallowing, vomiting. |
| Corn Plant | Dracaena fragrans | Saponins | Vomiting, loss of appetite, drooling. |
| Cornstalk Plant | Dracaena fragrans | Saponins | Vomiting, drooling. |
| Cow parsnip | Heracleum maximum | Furanocoumarins | Dermatitis, photosensitivity. |
| Cowbane | Cicuta species | Cicutoxin | Seizures, salivation, abdominal pain, potentially fatal. |
| Croton | Codiaeum variegatum | Diterpene esters | Irritation to the mouth and stomach, vomiting, diarrhea |
| Cuckoo-pint | Arum maculatum | Calcium oxalate crystals | Oral irritation, swelling, difficulty breathing. |
| Cutleaf Philodendron | Monstera deliciosa | Calcium oxalate crystals | Mouth swelling, irritation, vomiting. |
| Cycads | Cycas and Zamia species | Cycasin | Liver damage, vomiting, diarrhea. |
| Cyclamen | Cyclamen spp. | Saponins | Vomiting, diarrhea, seizures |
| Daffodil | Narcissus spp. | Lycorine and other alkaloids | Vomiting, hypersalivation, diarrhea |
| Dahlia | Dahlia species | Unknown | Mild gastrointestinal upset. |
| Daisy | Chrysanthemum species | Sesquiterpene, lactones | Vomiting, diarrhea, dermatitis. |
| Deadly Nightshade | Solanum spp | Solanine | Vomiting, drowsiness, respiratory depression. |
| Desert Azalea | Adenium obesum | Cardiac glycosides | Vomiting, lethargy, heart abnormalities. |
| Desert Rose | Adenium obesum | Cardiac glycosides | Vomiting, lethargy. |
| Devil’s Backbone | Kalanchoe tubiflora | Bufadienolides | Vomiting, diarrhea, heart issues. |
| Devil’s Ivy | Epipremnum aureum | Calcium oxalate crystals | Oral irritation, pain and swelling of mouth, tongue, lips |
| Dieffenbachia | Dieffenbachia spp. | Calcium oxalate crystals | Oral irritation, drooling, difficulty swallowing |
| Dock | Rumex sp. | Oxalates | Kidney stones, vomiting, diarrhea. |
| Dog Daisy | Achillea millefolium | Salicylic acid | Vomiting, diarrhea, dermatitis. |
| Dog Hobble | Leucothoe sp. | Grayanotoxins | Vomiting, depression, cardiovascular collapse. |
| Dogbane Hemp | Apocynum spp. | Cardiac glycosides | Vomiting, diarrhea, cardiac arrhythmia. |
| Dracaena | Dracaena spp. | Saponins | Vomiting (sometimes with blood), increased salivation, lack of appetite |
| Dumb Cane | Dieffenbachia amoena | Calcium oxalate crystals | Oral irritation, numbness of the mouth, excessive drooling, difficulty swallowing |
| Dwarf Poinciana | Caesalpinia pulcherrima | Tannins, toxic alkaloids | Vomiting, diarrhea. |
| Easter Rose | Helleborus niger | Protoanemonin | Abdominal pain, vomiting, diarrhea. |
| Eastern Star | Dianthus spp. | Unknown | Mild gastrointestinal upset. |
| Elephant Ears | Colocasia esculenta | Calcium oxalate crystals | Oral irritation, difficulty swallowing, vomiting. |
| Elephant-Ear Begonia | Begonia scharfii | Oxalic acid, soluble calcium oxalates | Kidney stones, mouth and GI tract irritation. |
| Emerald Feather | Asparagus densiflorus | Saponins | Mild gastrointestinal upset. |
| English Holly | Ilex aquifolium | Saponins | Vomiting, diarrhea, drowsiness. |
| English Ivy | Hedera helix | Saponins | Vomiting, abdominal pain, hypersalivation, diarrhea |
| English Yew | Taxus baccata | Alkaloids | Dizziness, dry mouth, dilation of pupils, paralysis, heart failure |
| Epazote | Chenopodium ambrosioides | Ascaridole | Gastrointestinal upset, lethargy. |
| Eucalyptus | Eucalyptus spp. | Eucalyptol | Vomiting, diarrhea, depression, weakness |
| European Bittersweet | Solanum dulcamara | Solanine | Vomiting, diarrhea, weakness. |
| European Holly | Ilex aquifolium | Saponins | Vomiting, diarrhea, drowsiness. |
| Everlasting Pea | Lathyrus latifolius | Amino acids, glycosides | Weakness, lethargy, seizures. |
| Exotica | Dieffenbachia amoena | Calcium oxalate crystals | Oral irritation, excessive drooling, difficulty swallowing. |
| False Bittersweet | Celastrus scandens | Triterpenoid saponins | Vomiting, diarrhea, weakness. |
| False Queen Anne’s Lace | Ammi majus | Furanocoumarins | Dermatitis, photosensitivity. |
| Feather Geranium | Ambrosia mexicana | Sesquiterpene lactones | Dermatitis, potential respiratory issues. |
| Fern Palm | Zamia spp. | Cycasin | Liver failure, vomiting, seizures. |
| Fetter Bush | Leucothoe spp. | Grayanotoxins | Vomiting, depression, cardiovascular collapse. |
| Fetterbush | Lyonia spp. | Grayanotoxins | Vomiting, depression. |
| Fiddle-Leaf | Philodendron bipennifolium | Calcium oxalate crystals | Mouth swelling, vomiting. |
| Fig | Ficus benjamina | Ficin, psoralens | Skin irritation, gastrointestinal upset. |
| Figwort | Ranunculus acris | Protoanemonin | Drooling, vomiting, diarrhea. |
| Fire Lily | Hippeastrum spp. | Lycorine | Vomiting, diarrhea. |
| Flag | Iris species | Iridin | Gastrointestinal upset, skin irritation. |
| Flamingo Flower | Anthurium scherzeranum | Calcium oxalate crystals | Oral irritation, difficulty swallowing. |
| Fleabane | Erigeron speciosus | Pyrethrins | Mild gastrointestinal upset, dermatitis. |
| Florida Beauty | Dracaena surculosa | Saponins | Vomiting, drooling. |
| Florist’s Calla | Zantedeschia aethiopica | Calcium oxalate crystals | Mouth and throat irritation, difficulty swallowing. |
| Foxglove | Digitalis purpurea | Cardiac glycosides | Cardiac arrhythmias, vomiting, diarrhea |
| Franciscan Rain Tree | Brunfelsia species | Brunfelsamidine | Muscle weakness, gastrointestinal upset. |
| Garden Calla | Zantedeschia aethiopica | Calcium oxalate crystals | Mouth and throat irritation, difficulty swallowing. |
| Garden Chamomile | Anthemis nobilis | Sesquiterpene lactones | Dermatitis, gastrointestinal upset, nervous system depression. |
| Garden Hyacinth | Hyacinthus orientalis | Oxalic acid | Vomiting, diarrhea, tremors. |
| Gardenia | Gardenia jasminoides | Genipin, gardenoside | Mild vomiting, diarrhea. |
| Garlic | Allium sativum | Organosulfides | Gastrointestinal upset, potential for hemolytic anemia. |
| Geranium | Pelargonium species | Geraniol, linalool | Vomiting, anorexia, dermatitis. |
| Geranium-Leaf Aralia | Polyscias guilfoylei | Not specifically toxic | Mild, if any, symptoms. |
| Giant Dracaena | Cordyline australis | Saponins | Vomiting, drooling. |
| Giant Dumb Cane | Dieffenbachia amoena | Calcium oxalate crystals | Oral irritation, excessive drooling, difficulty swallowing. |
| Giant Hogweed | Heracleum maximum | Furanocoumarins | Dermatitis, photosensitivity. |
| Glacier Ivy | Hedera helix | Triterpenoid saponins | Vomiting, abdominal pain, hypersalivation. |
| Gladiola | Gladiolus spp. | Isoquinoline alkaloids | Salivation, vomiting, drooling, lethargy |
| Gloriosa Lily | Gloriosa superba | Colchicine | Oral irritation, diarrhea, organ damage. |
| Gold Dieffenbachia | Dieffenbachia picta | Calcium oxalate crystals | Mouth swelling, vomiting, difficulty swallowing. |
| Gold Dust Dracaena | Dracaena surculosa | Saponins | Vomiting, drooling, loss of appetite. |
| Golden Birds Nest | Sansevieria trifasciata | Saponins | Nausea, vomiting, diarrhea. |
| Golden Pothos | Epipremnum aureum | Calcium oxalate crystals | Swelling of the oral area, vomiting. |
| Golden Ragwort | Senecio species | Pyrrolizidine alkaloids | Liver damage, gastrointestinal upset. |
| Good Luck Plant | Oxalis spp. | Oxalic acid | Kidney failure, tremors, salivation. |
| Grapefruit | Citrus paradisii | Essential oils, psoralens | Vomiting, diarrhea, photosensitivity. |
| Grass Palm | Cordyline australis | Saponins | Vomiting, drooling. |
| Greater Ammi | Ammi majus | Furanocoumarins | Dermatitis, photosensitivity. |
| Green Gold Naphthysis | Syngonium podophyllum | Calcium oxalate crystals | Oral irritation, pain, swelling. |
| Ground Apple | Anthemis nobilis | Sesquiterpene lactones | Dermatitis, gastrointestinal upset. |
| Groundsel | Senecio species | Pyrrolizidine alkaloids | Liver damage, gastrointestinal upset. |
| Hahn’s Self Branching English Ivy | Hedera helix | Triterpenoid saponins | Vomiting, abdominal pain, hypersalivation. |
| Hashish | Cannabis sativa | THC | Lethargy, drooling, incoordination, dilated pupils. |
| Hawaiian Ti | Giant Dracaena | Saponins | Vomiting, depression, anorexia. |
| Heartleaf Philodendron | Philodendron hederaceum | Calcium oxalate crystals | Mouth pain, swelling, vomiting, difficulty swallowing. |
| Heavenly Bamboo | Nandina domestica | Cyanogenic glycosides | Weakness, convulsions, respiratory failure, death. |
| Hellebore | Helleborus niger | Protoanemonin | Vomiting, abdominal pain, diarrhea. |
| Hemlock | Conium maculatum | Coniine | Muscle paralysis, respiratory failure |
| Hercules’ Club | Aralia spinosa | Saponins | Vomiting, diarrhea. |
| Hills of Snow | Hydrangea arborescens | Hydrangin | Vomiting, diarrhea, depression. |
| Holly | Ilex opaca | Saponins | Vomiting, diarrhea, depression. |
| Hops | Humulus lupulus | Resins, essential oils | Excitement, rapid breathing, temperature increase. |
| Horse Chestnut | Aesculus glabra | Saponins, glycosides | Vomiting, diarrhea, depression. |
| Horsehead Philodendron | Philodendron bipennifolium | Calcium oxalate crystals | Oral irritation, difficulty swallowing, vomiting. |
| Horseweed | Erigeron speciosus | Unknown | Mild gastrointestinal upset. |
| Hortensia | Hydrangea arborescens | Hydrangin | Vomiting, diarrhea. |
| Hosta | Hosta plataginea | Saponins | Vomiting, diarrhea. |
| Hurricane Plant | Monstera deliciosa | Calcium oxalate crystals | Mouth swelling, vomiting, difficulty swallowing. |
| Hyacinth | Hyacinthus orientalis | Oxalic acid and alkaloids | Vomiting, diarrhea, dermatitis |
| Hydrangea | Hydrangea spp. | Cyanogenic glycosides | Gastrointestinal upset, vomiting, diarrhea |
| Impala Lily | Adenium obesum | Cardiac glycosides | Vomiting, lethargy, heart abnormalities. |
| Inch Plant | Tradescantia flumeninsis | Unknown | Mild gastrointestinal upset. |
| Indian Apple | Podophyllum peltatum | Podophyllotoxin | Vomiting, diarrhea, lethargy. |
| Indian Borage | Coleus ampoinicus | Essential oils, diterpenes | Vomiting, diarrhea, depression. |
| Indian Hemp | Cannabis sativa | THC | Lethargy, drooling, incoordination, dilated pupils. |
| Indian Pink | Lobelia cardinalis | Lobeline | Vomiting, diarrhea, excessive salivation. |
| Indian Rubber Plant | Ficus benjamina | Ficin, psoralens | Skin irritation, gastrointestinal upset. |
| Inkberry | Ilex opaca | Saponins | Vomiting, diarrhea, depression. |
| Iris | Iris species | Iridin | Gastrointestinal upset, skin irritation. |
| Iron Cross Begonia | Begonia masoniana | Oxalic acid, soluble calcium oxalates | Kidney stones, mouth and GI tract irritation. |
| Ivy Arum | Epipremnum aureum | Calcium oxalate crystals | Oral irritation, difficulty swallowing. |
| Jack-in-the-pulpit | Arisaema triphyllum | Calcium oxalate crystals | Mouth and throat swelling, difficulty breathing. |
| Jade Plant | Crassula ovata | Unknown | Vomiting, lethargy, depression |
| Japanese Yew | Taxus cuspidata | Alkaloids | Acute cardiac failure, death |
| Jerusalem Cherry | Solanum pseudocapsicum | Solanine | Gastrointestinal distress, weakness, hypothermia. |
| Jerusalem Oak | Ambrosia mexicana | Sesquiterpene lactones | Contact dermatitis, vomiting, anorexia. |
| Jimson Weed | Datura spp. | Tropane alkaloids | Visual and auditory hallucinations, increased heart rate |
| Jonquil | Narcissus jonquilla | Lycorine | Vomiting, diarrhea, abdominal pain. |
| Kaffir Lily | Clivia minata | Lycorine | Mild vomiting, drooling, diarrhea. |
| Kalanchoe | Kalanchoe spp. | Bufadienolides, cardiac glycosides | Vomiting, diarrhea, heart arrhythmias |
| Kiss-me-quick | Brunfelsia species | Brunfelsamidine | Lycorine |
| Klamath Weed | Hypericum perforatum | Hypericin | Lycorine |
| Kudu Lily | Adenium obesum | Cardiac glycosides | Vomiting, lethargy, heart abnormalities. |
| Lace Fern | Asparagus setaceus | Sapogenin | Allergic dermatitis, vomiting, diarrhea |
| Lacy Tree Philodendron | Philodendron selloum | Calcium oxalate crystals | Oral irritation, swelling, difficulty swallowing. |
| Lady-of-the-night | Brunfelsia species | Brunfelsamidine | Gastrointestinal upset, muscle weakness. |
| Lambkill | Kalmia augustifolia | Grayanotoxins | Vomiting, diarrhea, cardiac issues. |
| Lantana | Lantana camara | Triterpenoids | Vomiting, diarrhea, labored breathing, weakness |
| Larkspur | Delphinium species | Alkaloids | Vomiting, diarrhea, nervous system depression. |
| Laurel | Kalmia latifolia | Grayanotoxins | Vomiting, cardiac abnormalities, depression. |
| Lavender | Lavendula angustifolia | Linalool, linalyl acetate | Mild gastrointestinal upset, central nervous system depression. |
| Leatherflower | Clematis sp. | Protoanemonin | Vomiting, diarrhea, excessive drooling. |
| Leek | Allium ampeloprasum | Organosulfides | Gastrointestinal upset, potential for hemolytic anemia. |
| Lemon | Citrus limonia | Essential oils, psoralens | Vomiting, diarrhea, photosensitivity. |
| Lemon Grass | Cymbopogon citratus | Essential oils | Mild gastrointestinal upset. |
| Lemon Verbena | Aloysia triphylla | Essential oils | Mild gastrointestinal irritation. |
| Lenten Rose | Helleborus niger | Protoanemonin | Abdominal pain, vomiting, diarrhea. |
| Lily of the Palace | Hippeastrum spp. | Lycorine | Vomiting, lethargy, diarrhea. |
| Lily of the Valley | Convallaria majalis | Cardenolides | Vomiting, irregular heartbeat, low blood pressure |
| Lily-of-the-Valley Bush | Pieris japonica | Grayanotoxins | Vomiting, diarrhea, cardiovascular collapse. |
| Lime | Citrus aurantifolia | Essential oils, psoralens | Vomiting, diarrhea, photosensitivity. |
| Lobelia | Lobelia cardinalis | Lobeline | Vomiting, diarrhea, excessive salivation. |
| Locust | Robinia spp. | Robin, robitin, lectins | Nausea, vomiting, diarrhea. |
| Lord-and-Ladies | Arum maculatum | Calcium oxalate crystals | Oral irritation, swelling, difficulty swallowing. |
| Lovage | Levisticum officinale | Furanocoumarins | Photosensitivity, dermatitis. |
| Lupine | Lupinus spp. | Alkaloids | Vomiting, lethargy, convulsions |
| Macadamia Nut | Macadamia integrifolia | Unknown | Weakness, depression, vomiting, hyperthermia. |
| Madagascar Dragon Tree | Dracaena marginata | Saponins | Vomiting (sometimes with blood), increased salivation, lack of appetite |
| Maidens Breath | Gypsophila elegans | Saponins | Gastrointestinal irritation. |
| Malanga | Colocasia esculenta | Calcium oxalate crystals | Oral irritation, difficulty swallowing, vomiting. |
| Maleberry | Lyonia sp. | Grayanotoxins | Vomiting, depression, potential cardiovascular collapse. |
| Mapleleaf Begonia | Begonia cleopatra | Oxalic acid, soluble calcium oxalates | Kidney stones, mouth and GI tract irritation. |
| Marble Queen | Epipremnum aureum | Calcium oxalate crystals | Oral irritation, pain and swelling of mouth, tongue, lips |
| Marijuana | Cannabis sativa | THC | Lethargy, drooling, incoordination, dilated pupils. |
| Marjoram | Origanum majorana | Essential oils | Mild gastrointestinal upset. |
| Mauna Loa Peace Lily | Spathiphyllum | Calcium oxalate crystals | Oral irritation, difficulty swallowing, vomiting. |
| Mayapple | Podophyllum peltatum | Podophyllotoxin | Vomiting, diarrhea, lethargy. |
| Mayweed | Anthemis cotula | Volatile oils | Dermatitis, vomiting, anorexia. |
| Meadow Saffron | Colchicum autumnale | Colchicine | Gastrointestinal upset, organ damage, potentially fatal. |
| Metallic Leaf Begonia | Begonia metallica | Oxalic acid, soluble calcium oxalates | Kidney stones, mouth and GI tract irritation. |
| Mexican Breadfruit | Monstera deliciosa | Calcium oxalate crystals | Mouth swelling, vomiting, difficulty swallowing. |
| Milfoil | Achillea millefolium | Sesquiterpene lactones | Dermatitis, gastrointestinal upset. |
| Milkweed | Asclepias species | Cardiac glycosides | Vomiting, weakness, potentially fatal. |
| Mint | Mentha sp. | Essential oils | Mild gastrointestinal upset. |
| Mistletoe | Viscum album | Phoratoxin | Vomiting, diarrhea, heart problems |
| Mock Azalea | Adenium obesum | Cardiac glycosides | Vomiting, lethargy, heart abnormalities. |
| Mole Bean Plant | Ricinus communis | Ricin | Severe abdominal pain, vomiting, diarrhea, seizures. |
| Monkshood | Aconitum napellus | Aconitine | Gastrointestinal upset, heart palpitations, death |
| Morning Glory | Ipomoea spp. | Lysergic alkaloids | Hallucinations, gastrointestinal distress |
| Morning-Noon-and-Night | Brunfelsia species | Brunfelsamidine | Muscle weakness, gastrointestinal upset. |
| Moses-in-the-Cradle | Tradescantia spathacea | Irritants | Skin irritation, oral irritation, nausea, vomiting |
| Moss Rose | Portulaca oleracea | Soluble oxalates | Kidney stones, vomiting, diarrhea. |
| Mother of Millions | Kalanchoe tubiflora | Bufadienolides | Vomiting, diarrhea, heart abnormalities. |
| Mother-in-Law | Monstera deliciosa | Calcium oxalate crystals | Mouth swelling, vomiting, difficulty swallowing. |
| Mother-In-Law Plant | Kalanchoe tubiflora | Bufadienolides | Vomiting, heart issues. |
| Mother-in-Law’s Tongue | Sansevieria trifasciata | Saponins | Nausea, vomiting, diarrhea. |
| Mountain Laurel | Kalmia latifolia | Grayanotoxins | Gastrointestinal upset, cardiac issues |
| Naked Lady | Amaryllis spp. | Lycorine | Vomiting, depression, diarrhea. |
| Nandina | Nandina domestica | Cyanogenic glycosides | Weakness, convulsions, respiratory failure, coma. |
| Narcissus | Narcissus spp | Lycorine | Vomiting, diarrhea, abdominal pain. |
| Natal Plum | Carissa macrocarpa | Glycosides | Gastrointestinal distress |
| Needlepoint Ivy | Hedera helix | Triterpenoid saponins | Vomiting, abdominal pain, hypersalivation. |
| Nephthytis | Syngonium podophyllum | Calcium oxalate crystals | Oral irritation, difficulty swallowing |
| Nicotiana | Nicotiana glauca | Nicotine | Tremors, increased heart rate, collapse. |
| Night Blooming Jasmine | Cestrum nocturnum | Toxins | Gastrointestinal upset, nervous symptoms |
| Nightshade | Solanum spp | Solanine | Gastrointestinal upset, lethargy, weakness. |
| Norfolk Island Pine | Araucaria heterophylla | Mild toxins | Vomiting, diarrhea |
| Octopus Tree | Schefflera or Brassia actinoplylla | Calcium oxalate crystals | Mouth irritation, difficulty swallowing, vomiting. |
| Oilcloth Flower | Anthurium scherzeranum | Calcium oxalate crystals | Oral irritation, difficulty swallowing. |
| Oleander | Nerium oleander | Cardiac glycosides | Abdominal pain, serious heart problems, death |
| Onion | Allium cepa | N-propyl disulfide | Gastrointestinal irritation, hemolytic anemia. |
| Orange | Citrus sinensis | Essential oils, psoralens | Vomiting, diarrhea, photosensitivity. |
| Oregano | Origanum vulgare hirtum | Essential oils | Mild gastrointestinal upset. |
| Oregon Holly | Ilex opaca | Saponins | Vomiting, diarrhea, depression. |
| Ornamental Pepper | Solanum pseudocapsicum | Solanine | Gastrointestinal upset, lethargy, weakness. |
| Oyster Plant | Tradescantia spathacea | Irritants | Skin and oral irritation |
| Pacific Yew | Taxus brevifolia | Taxine | Tremors, difficulty breathing, potential heart failure. |
| Painter’s Pallette | Anthurium scherzeranum | Calcium oxalate crystals | Oral irritation, difficulty swallowing. |
| Palm Lily | Cordyline australis | Saponins | Vomiting, drooling. |
| Panda Plant | Philodendron bipennifolium | Calcium oxalate crystals | Mild gastrointestinal upset |
| Paperwhite | Narcissus papyraceus | Lycorine | Vomiting, diarrhea, abdominal pain |
| Paraguayan Jasmine | Brunfelsia species | Brunfelsamidine | Muscle weakness, gastrointestinal upset. |
| Parlor Palm | Chamaedorea elegans | Unknown | Mild gastrointestinal upset |
| Parsley | Petroselinum crispum | Furanocoumarins | Photosensitization, dermatitis. |
| Peace Begonia | Begonia rex ‘peace’ | Oxalic acid, soluble calcium oxalates | Kidney stones, mouth and GI tract irritation. |
| Peace Lily | Spathiphyllum spp. | Calcium oxalate crystals | Oral irritation, nausea, vomiting |
| Peach | Prunus persica | Cyanogenic glycosides (in pits) | Cyanide poisoning from pits; gastrointestinal upset. |
| Peacock Flower | Caesalpinia pulcherrima | Tannins, toxic alkaloids | Vomiting, diarrhea. |
| Pencil Cactus | Euphorbia tirucalli | Diterpene esters | Irritation, swelling, and pain on contact. Vomiting if ingested. |
| Peony | Paeonis officinalis | Paeonol | Vomiting, diarrhea. |
| Peperomia | Peperomia spp. | Unknown | Mild irritation upon ingestion |
| Perennial Pea | Lathyrus latifolius | Amino acids, glycosides | Weakness, lethargy, seizures. |
| Periwinkle | Vinca minor | Alkaloids | Vomiting, diarrhea, depression |
| Persian Shield | Strobilanthes dyerianus | Unknown | Gastrointestinal upset if ingested |
| Philodendron | Philodendron spp. | Calcium oxalate crystals | Oral irritation, pain and swelling of mouth, tongue, lips |
| Pie Plant | Rheum rhabarbarium | Oxalic acid | Kidney failure, tremors, salivation. |
| Pieris | Pieris japonica | Grayanotoxins | Vomiting, diarrhea, depression. |
| Pig Lily | Zantedeschia aethiopica | Calcium oxalate crystals | Mouth and throat swelling, vomiting, difficulty breathing. |
| Piggyback Plant | Tolmiea menziesii | Unknown | Mild stomach upset if ingested |
| Pigtail Plant | Anthurium scherzeranum | Calcium oxalate crystals | Oral irritation, difficulty swallowing, vomiting. |
| Pineapple Sage | Salvia elegans | Unknown | Gastrointestinal upset if ingested in large quantities |
| Pink Pearl | Begonia semperflorens cultivar | Oxalic acid, soluble calcium oxalates | Kidney stones, irritation of mouth and GI tract if ingested. |
| Pink Polka Dot Plant | Hypoestes phyllostachya | Unknown | Mild irritation if ingested |
| Pinks | Dianthus caryophyllus | Unknown | Mild gastrointestinal upset. |
| Plantain Lily | Hosta plantaginea | Saponins | Vomiting, diarrhea. |
| Plum | Prunus domestica | Cyanogenic glycosides | Pitted fruit can cause cyanide poisoning. |
| Plumbago | Plumbago auriculata | Unknown | Skin irritation, gastrointestinal upset if ingested |
| Plumosa Fern | Asparagus densiflorus cv sprengeri | Saponins | Mild gastrointestinal upset. |
| Poinciana | Caesalpinia gilliessi | Not specified | Information not available; toxicity in dogs not well-documented. |
| Poinsettia | Euphorbia pulcherrima | Diterpenoid euphorbol esters | Mild irritation to mouth and stomach, sometimes vomiting |
| Poinsettia | Euphorbia pulcherrima | Diterpene esters | Mild gastrointestinal upset, irritation of mouth and stomach. |
| Poison Daisy | Anthemis cotula | Volatile oils | Dermatitis, gastrointestinal upset. |
| Poison Parsnip | Cicuta maculata | Cicutoxin | Seizures, abdominal pain, potentially fatal. |
| Ponytail Palm | Beaucarnea recurvata | Unknown | Mild irritation if ingested |
| Porcelain Flower | Hoya carnosa | Unknown | Mild irritation if ingested |
| Portulaca | Portulaca oleracea | Soluble oxalates | Gastrointestinal upset in some pets if ingested |
| Potato Plant | Solanum tuberosum | Solanine | Gastrointestinal upset, headache, lethargy |
| Prayer Bean | Abrus precatorius | Abrin | Severe vomiting, diarrhea, tremors, fatal if seeds are chewed. |
| Prayer Plant | Maranta leuconeura | Unknown | Mild irritation if ingested |
| Pride-of-India | Melia azedarach | Tetranortriterpenes | Vomiting, seizures, potentially fatal. |
| Primrose | Primula spp. | Primin (a form of urushiol), saponins | Dermatitis, mild gastrointestinal upset |
| Primrose | Primula vulgaris | Saponins | Mild gastrointestinal upset. |
| Privet | Ligustrum japonicum | Glycosides | Vomiting, diarrhea, abdominal pain. |
| Purple Heart Plant | Tradescantia pallida | Unknown | Skin irritation, gastrointestinal upset if ingested |
| Purple Passion Plant | Gynura aurantiaca | Unknown | Skin and oral irritation if ingested |
| Purslane | Portulaca oleracea | Oxalates, nitrates | Gastrointestinal irritation, kidney failure if consumed in large amounts. |
| Pygmy Date Palm | Phoenix roebelenii | Unknown | Gastrointestinal upset if ingested |
| Queen’s Tears | Billbergia nutans | Unknown | Mild irritation if ingested |
| Queensland Nut | Macadamia integrifolia | Unknown | Weakness, depression, vomiting, hyperthermia in dogs. |
| Rabbit Foot Fern | Davallia fejeensis | Unknown | Mild gastrointestinal upset if ingested in large quantities |
| Racemose asparagus | Asparagus densiflorus cv sprengeri | Saponins | Mild gastrointestinal upset. |
| Ragwort | Senecio species | Pyrrolizidine alkaloids | Liver damage, digestive issues; symptoms may be delayed. |
| Rainbow Plant | Byblis liniflora | Unknown | Generally considered non-toxic, but limited information |
| Ranger’s Button | Sphenosciadium capitellatum | Not well-documented | Specific symptoms not well-documented; handle with care. |
| Red Emerald | Philodendron bipennifolium | Calcium oxalate crystals | Mouth irritation, difficulty swallowing. |
| Red Princess | Philodendron bipennifolium | Calcium oxalate crystals | Oral irritation, difficulty swallowing, gastrointestinal upset. |
| Red-Marginated Dracaena | Dracaena marginata | Not significantly toxic | Mild mouth and stomach irritation if ingested. |
| Rex Begonia | Begonia rex | Oxalate crystals | Oral irritation, gastrointestinal upset |
| Rex Begonia | Begonia rex | Oxalic acid, soluble calcium oxalates | Kidney stones, irritation of mouth and GI tract. |
| Rhododendron | Rhododendron spp | Grayanotoxins | Vomiting, diarrhea, hypotension, coma in severe cases. |
| Rhubarb | Rheum rhabarbarum | Oxalic acid, anthraquinone glycosides | Vomiting, diarrhea, tremors, kidney failure |
| Ribbon Plant | Dracaena sanderiana | Saponins | Vomiting, salivation |
| Ridderstjerne | Hippeastrum spp. | Lycorine and other alkaloids | Nausea, vomiting, diarrhea. Generally low toxicity. |
| Rock Moss | Portulaca oleracea | Lycorine and other alkaloids | Nausea, vomiting, diarrhea. |
| Roman Chamomile | Anthemis nobilis | Oxalic acid, nitrates | Kidney stones, gastrointestinal issues in large amounts. |
| Rosary Vine | Ceropegia woodii | Unknown | Mild gastrointestinal upset if ingested |
| Rose of Sharon | Hibiscus syriacus | Unknown | Vomiting, diarrhea, nausea |
| Rosebay | Rhododendron spp | Grayanotoxins | Salivation, vomiting, diarrhea, cardiac issues. |
| Royal Fern | Osmunda regalis | Unknown | Mild gastrointestinal upset if ingested |
| Rubber Plant | Ficus elastica | Caoutchouc, proteolytic enzymes | Skin irritation, stomach upset, vomiting |
| Running Myrtle | Vinca rosea | Vinca alkaloids | Vomiting, diarrhea, low blood pressure. |
| Sabi Star | Adenium obesum | Cardiac glycosides | Vomiting, lethargy, heart abnormalities. |
| Sacred Bamboo | Nandina domestica | Cyanogenic glycosides | Weakness, convulsions, respiratory failure, coma. |
| Saddle Leaf | Philodendron bipennifolium | Calcium oxalate crystals | Swelling of mouth, difficulty in swallowing, irritation. |
| Sago Palm | Cycas revoluta | Cycasin | Vomiting, liver failure, death |
| Satin Pothos | Scindapsus pictus | Calcium oxalate crystals | Irritation of mouth, difficulty swallowing. |
| Scented Geranium | Pelargonium sp. | Essential oils | Mild skin irritation, rarely gastrointestinal upset. |
| Schefflera | Schefflera | Calcium oxalate crystals | Mouth irritation, difficulty swallowing. |
| Seaside Daisy | Erigeron speciosus | Pyrethrins | Mild gastrointestinal upset, dermatitis. |
| Seven Bark | Hydrangea arborescens | Hydrangin | Gastrointestinal upset, diarrhea, vomiting. |
| Shamrock Plant | Oxalis spp. | Oxalic acid | Nausea, vomiting, diarrhea. |
| Shatavari | Asparagus densiflorus cv sprengeri | Saponins | Mild gastrointestinal upset. |
| Showy Daisy | Erigeron speciosus | Pyrethrins | Mild gastrointestinal upset, dermatitis. |
| Silver Dollar | Crassula arborescens | Cardiac glycosides | Nausea, vomiting, rarely heart rhythm disturbances. |
| Silver Jade Plant | Crassula arborescens | Cardiac glycosides | Nausea, vomiting, rarely heart rhythm disturbances. |
| Skunk Cabbage | Symplocarpus foetidus | Calcium oxalate crystals | Oral irritation, burning sensation in mouth and throat. |
| Snake Lilly | Iris species | Iridin | Gastrointestinal upset, skin irritation. |
| Snake Plant | Sansevieria trifasciata | Saponins | Nausea, vomiting, diarrhea |
| Solomon’s Lily | Arum palestinum | Calcium oxalate | Mouth and throat swelling, digestive upset. |
| Sorrel | Rumex scutatus | Oxalic acid, anthraquinones | Kidney stones, gastrointestinal irritation. |
| Sowbread | Cyclamen spp | Triterpene saponins | Gastrointestinal upset, heart rhythm abnormalities. |
| Spanish Thyme | Coleus ampoinicus | Essential oils, diterpenes | Gastrointestinal upset, skin irritation. |
| Spindle Tree | Euonymus atropurpurea | Cardiac glycosides, alkaloids | Nausea, vomiting, weakness, cardiac effects. |
| Split Leaf Philodendron | Philodendron bipennifolium | Calcium oxalate crystals | Mouth and throat swelling, digestive upset. |
| Spotted Dumb Cane | Dieffenbachia amoena | Calcium oxalate | Oral irritation, difficulty swallowing. |
| Sprengeri Fern | Asparagus densiflorus cv sprengeri | Saponins | Mild gastrointestinal upset. |
| Spring Parsley | Cymopterus watsonii | Furanocoumarins | Photosensitivity, dermatitis. |
| St. John’s Wort | Hypericum perforatum | Hypericin | Photosensitivity, gastrointestinal discomfort. |
| Staggerbush | Lyonia sp. | Grayanotoxins | Nausea, vomiting, and cardiovascular effects. |
| Starch Root | Arum maculatum | Calcium oxalate | Swelling of mouth, throat, gastrointestinal distress. |
| Starleaf | Brassaia actinophylla | Calcium oxalate crystals | Mouth irritation, difficulty swallowing. |
| Stinking Chamomile | Anthemis cotula | Volatile oils | Dermatitis, nausea if ingested. |
| Straight-Margined Dracaena | Dracaena marginata | Not significantly toxic | Mild irritation in mouth and stomach if ingested. |
| Striped Dracaena | Dracaena deremensis | Not significantly toxic | Mild irritation in mouth and stomach if ingested. |
| Superb Lily | Gloriosa superba | Colchicine | Nausea, vomiting, diarrhea, possible organ failure. |
| Sweet Cherry | Prunus avium | Cyanogenic glycosides (in seeds) | Ingestion of seeds can cause headache, dizziness, vomiting. |
| Sweet William | Dianthus caryophyllus | Not significantly toxic | Generally safe; may cause mild gastrointestinal discomfort if ingested. |
| Sweetheart Ivy | Hedera helix | Triterpenoid saponins | Can cause vomiting, abdominal pain, hypersalivation. |
| Swiss Cheese Plant | Monstera deliciosa | Calcium oxalate crystals | Mouth irritation, difficulty swallowing. |
| Tahitian Bridal Veil | tradescantia multiflora | Not significantly toxic | Generally considered non-toxic; mild irritation if ingested. |
| Tail Flower | Anthurium scherzeranum | Calcium oxalate crystals | Mouth and throat irritation, difficulty in swallowing. |
| Taro | Colocasia esculenta | Calcium oxalate crystals | Irritation of mouth and throat; cooking reduces toxicity. |
| Taro Vine | Epipremnum aureum | Calcium oxalate crystals | Mouth and throat irritation, difficulty in swallowing. |
| Tarragon | Artemisia dracunculus | Estragole | Generally safe in food; excessive amounts may cause risk. |
| Texas Umbrella Tree | Melia azedarach | Tetranortriterpenes | Vomiting, seizures, coma or death in severe cases. |
| Ti-Plant | Cordyline terminalis | Saponins | Mild if ingested; can cause stomach upset. |
| Tobacco | Nicotiana glauca | Nicotine, anabasine | Dizziness, vomiting, respiratory failure. |
| Tomato Plant | Solanum lycopersicum | Solanine | Gastrointestinal upset, weakness, confusion |
| Tree Philodendron | Philodendron selloum | Calcium oxalate | Mouth and throat swelling, difficulty in swallowing, irritation. |
| Tree Tobacco | Nicotiana glauca | Nicotine, anabasine | Can cause dizziness, vomiting, respiratory failure. |
| Tropic Snow | Dieffenbachia amoena | Calcium oxalate | Can cause oral irritation, difficulty in speaking and swallowing. |
| True Aloe | Aloe barbadensis | Anthraquinones | Can cause vomiting, diarrhea; topical use generally safe. |
| Trumpet Lily | Zantedeschia aethiopica | Calcium oxalate | Swelling of the mouth and throat, eye irritation, and diarrhea. |
| Tulip | Tulipa spp. | Alkaloids | Vomiting, depression, diarrhea, hyper-salivation |
| Umbrella Leaf | Podophyllum peltatum | Podophyllotoxin | Irritation of the mouth, intense digestive disturbance, nervous symptoms. |
| Umbrella Leaf | Podophyllum peltatum | Podophyllotoxin | Can cause irritation of the mouth, intense digestive disturbance, and nervous symptoms. |
| Umbrella Tree | Schefflera actinophylla | Calcium oxalate crystals | Oral irritation, difficulty in swallowing |
| Variable Dieffenbachia | Dieffenbachia picta | Calcium oxalate | Intense mouth and throat swelling, difficulty speaking or swallowing. |
| Variegated Laurel | Tradescantia flumeninsis | Not significantly toxic | Generally non-toxic; mild irritation if ingested. |
| Variegated Philodendron | Scindapsus, Philodendron spp | Calcium oxalate | Can cause swelling, pain in mouth and throat, difficulty swallowing. |
| Vinca | Vinca rosea | Vincristine, Vinblastine | Can cause blood pressure drops, depression, convulsions, fatal. |
| Virgin’s Bower | Clematis sp. | Protoanemonin | Can cause mouth irritation, digestive upset. |
| Wahoo | Euonymus occidentalis | Not well-documented for toxicity | May cause diarrhea, weakness, heart problems. |
| Wake Robin | Arum maculatum | Calcium oxalate | Swelling, gastrointestinal upset. |
| Warneckei Dracaena | Dracaena deremensis | Not significantly toxic | Non-toxic to humans; mild stomach upset in pets. |
| Water Flag | Iris species | Iridin | Ingestion can cause stomach pain, nausea, vomiting, diarrhea. |
| Water Hemlock | Cicuta maculata | Cicutoxin | Extremely toxic; can cause seizures, abdominal pain, fatal. |
| Wax-Leaf | Ligustrum japonicum | Ligustrin | May cause stomach upset if ingested. |
| Weeping Fig | Ficus sp. | Ficusin (latex) | Can cause skin and oral irritation. |
| Western Yew | Taxus brevifolia | Taxine | Highly toxic; can cause dizziness, mouth dryness, pupil dilation, fatal. |
| White Heads | Sphenosciadium capitellatum | Not well-documented for toxicity | Specific toxicity information not well-documented, caution advised. |
| Wild Calla | Arum palestinum | Calcium oxalate | Can cause swelling of the mouth, throat, difficulty breathing, gastrointestinal upset. |
| Wild Carnation | Dianthus caryophyllus | Not significantly toxic | Generally considered safe, but may cause mild gastrointestinal discomfort if ingested. |
| Wild Coffee | Polyscias guilfoylei | Not typically toxic | Generally considered non-toxic, but ingestion may cause mild stomach upset. |
| Winter Cherry | Solanum pseudocapsicum | Solanine | Can cause abdominal pain, vomiting, and diarrhea. |
| Winterberry | Ilex opaca | Saponins | Ingestion can cause nausea, vomiting, diarrhea, reduced heart rate. |
| Wisteria | Wisteria spp. | Glycosides and lectins | Vomiting, diarrhea |
| Yarrow | Achillea millefolium | Sesquiterpene lactones, flavonoids, tannins | Safe in small amounts; large quantities can cause drowsiness, skin irritation, light sensitivity. |
| Yellow Oleander | Thevetia peruviana | Cardiac glycosides | Can cause abdominal pain, vomiting, diarrhea, heart irregularities; potentially fatal. |
| Yesterday, Today, Tomorrow | Brunfelsia species | Brunfelsamidine, Scopoletin | May cause gastrointestinal issues, muscle weakness, tremors, seizures; potentially fatal. |
| Yew | Taxus spp. | Alkaloids | Dizziness, dry mouth, dilation of pupils, paralysis, heart failure |
| Yew Pine | Podocarpus macrophylla | Podocarpin, toxic seeds | Ingestion of large quantities of seeds may cause mild stomach upset. |
| Yucca | Yucca spp. | Saponins | Ingestion can lead to vomiting, diarrhea, and in rare cases, liver and kidney damage. |
| ZZ Plant | Zamioculcas zamiifolia | Calcium oxalate crystals | Oral irritation, diarrhea, vomiting |
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