Cause poisoning of varying severity, most often vomiting, diarrhea, drooling, and mouth irritation. Keep them out of your cat's reach and call the vet if any is eaten.
Alocasia Alocasia spp.
Also: Elephant earCalcium oxalate crystals. Mouth pain and swelling, drooling, vomiting, difficulty swallowing.
Aloe Aloe vera
Also: Aloe veraSaponins and anthraquinones. Vomiting, lethargy, diarrhea.
Amaryllis Amaryllis spp., Hippeastrum spp.
Also: Hippeastrum, belladonna lilyVomiting, depression, diarrhea, abdominal pain, drooling, loss of appetite, tremors. The bulb is the most toxic part.
Anthurium Anthurium spp.
Also: Flamingo flowerCalcium oxalate crystals. Mouth pain and swelling, drooling, vomiting, difficulty swallowing.
Apple Tree Malus spp.
Also: CrabappleCyanogenic glycosides in the stems, leaves, and seeds, especially when wilting. Bright red mucous membranes, dilated pupils, difficulty breathing, shock.
Asparagus Fern Asparagus spp.
Also: Emerald fern, plumosa fernThe berries cause vomiting, diarrhea, and abdominal pain, and repeated contact with the plant causes allergic dermatitis. It is not actually a fern.
Bay Laurel Laurus nobilis
Also: Bay leaf, sweet bayEssential oils. Vomiting and diarrhea; large whole leaves can cause an intestinal obstruction.
Begonia Begonia spp.
Soluble oxalates, mostly in the underground parts. Vomiting, drooling.
Bittersweet Nightshade Solanum dulcamara
Also: Climbing nightshade, woody nightshadeSolanine. Drooling, loss of appetite, severe digestive upset, diarrhea, drowsiness, weakness, dilated pupils, slow heart rate.
Boxwood Buxus sempervirens
Also: BoxAlkaloids. Vomiting and diarrhea.
Buttercup Ranunculus spp.
Also: RanunculusProtoanemonin. Vomiting, diarrhea, depression, loss of appetite, drooling, mouth ulcers, unsteady gait.
Caladium Caladium spp.
Also: Colocasia and other "elephant ears"Calcium oxalate crystals. Mouth pain and swelling, drooling, vomiting, difficulty swallowing.
Calla Lily Zantedeschia aethiopica
Also: Arum lily, ZantedeschiaThe same oxalate crystals: mouth pain, drooling, vomiting. Does not cause kidney failure.
Carnation Dianthus spp.
Also: Pinks, sweet William, DianthusMild gastrointestinal signs, mild dermatitis.
Cherry and Other Stone Fruits Prunus spp.
Also: Plum, apricot, peach, chokecherryCyanogenic glycosides in the stems, leaves, and seeds, especially when wilting. Bright red mucous membranes, dilated pupils, difficulty breathing, shock.
Chinese Evergreen Aglaonema spp.
Also: AglaonemaCalcium oxalate crystals. Mouth pain and swelling, drooling, vomiting, difficulty swallowing.
Chrysanthemum Chrysanthemum spp.
Also: MumPyrethrins and lactones. Vomiting, diarrhea, drooling, incoordination, dermatitis.
Citrus Citrus spp.
Also: Lemon, orange, mandarinEssential oils and psoralens. Vomiting, diarrhea, depression, possible skin photosensitivity.
Clematis Clematis spp.
Also: Virgin's bower, leather flowerProtoanemonin. Drooling, vomiting, diarrhea.
Clivia Clivia miniata
Also: Kaffir lily, bush lilyVomiting, drooling, diarrhea; large amounts can cause seizures, low blood pressure, tremors, and irregular heart rhythm. The bulb is the most poisonous part. Not a true lily, but toxic.
Cordyline Cordyline spp.
Also: Ti plantSaponins. Vomiting, sometimes with blood, depression, loss of appetite, drooling, dilated pupils in cats.
Cyclamen Cyclamen spp.
Also: SowbreadSaponins. Drooling, vomiting, diarrhea; eating large amounts of tubers can cause irregular heart rhythm, seizures, and death.
Daffodil Narcissus spp.
Also: Narcissus, jonquilThe bulbs are the most poisonous part. Vomiting, drooling, diarrhea; large amounts can cause seizures, low blood pressure, tremors, and irregular heart rhythm.
Dahlia Dahlia spp.
Mild gastrointestinal signs, mild dermatitis.
Daphne Daphne mezereum
Also: February daphne, mezereonNot on the ASPCA list. According to Pet Poison Helpline, the leaves, bark, and berries contain irritant toxins and are dangerous to cats.
Delphinium Delphinium spp.
Also: LarkspurAlkaloids cause neuromuscular paralysis. Constipation, colic, drooling, muscle tremors, stiffness, weakness, seizures, possible heart failure. Call your vet right away.
Dieffenbachia Dieffenbachia spp.
Also: Dumb caneCalcium oxalate crystals. Pain and swelling of the mouth, tongue, and lips, drooling, vomiting, difficulty swallowing.
Dracaena Dracaena spp.
Also: Corn plant, dragon treeSaponins. Vomiting, sometimes with blood, depression, loss of appetite, drooling, dilated pupils in cats.
Eucalyptus Eucalyptus spp.
Eucalyptus oil. Drooling, vomiting, diarrhea, depression, weakness.
Euonymus Euonymus spp.
Also: Spindle tree, burning bushAlkaloids and cardiac glycosides. Vomiting, diarrhea, abdominal pain, weakness; large doses can cause irregular heart rhythm.
Ficus Ficus benjamina, Ficus elastica
Also: Weeping fig, rubber plantIrritates the stomach and intestines; the sap irritates the skin.
Gardenia Gardenia jasminoides
Also: Cape jasmineMild vomiting and diarrhea, hives.
Geranium Pelargonium spp.
Also: Pelargonium, zonal geraniumGeraniol and linalool. Vomiting, loss of appetite, depression, dermatitis.
Gladiolus Gladiolus spp.
Also: Sword lilyThe corm contains the most toxins. Drooling, vomiting, lethargy, diarrhea.
Hellebore Helleborus spp.
Also: Christmas rose, Lenten roseCardiac glycosides, saponins, protoanemonin. Drooling, abdominal pain, diarrhea, depression. Call your vet right away.
Holly Ilex spp.
Saponins. Vomiting, diarrhea, depression. Often brought indoors for the holidays.
Hosta Hosta spp.
Also: Plantain lilySaponins. Vomiting, diarrhea, depression.
Hyacinth Hyacinthus orientalis
The bulb contains the most toxins. Vomiting, diarrhea, dermatitis, allergic reactions.
Hydrangea Hydrangea spp.
Cyanogenic glycoside. Vomiting, depression, diarrhea. Cyanide poisoning is rare; usually only the digestive tract is affected.
Iris Iris spp.
Also: FlagThe rhizome contains the most toxins. Drooling, vomiting, lethargy, diarrhea.
Jade Plant Crassula ovata
Also: Money plant, CrassulaVomiting, wobbliness as if drunk, rarely tremors. Do not confuse it with the Pachira, also called a money tree: that one is nontoxic.
Kalanchoe Kalanchoe spp.
Cardiac glycosides in the leaves. Vomiting, diarrhea, rarely irregular heart rhythm.
Lavender Lavandula angustifolia
Also: English lavenderLinalool and linalyl acetate. Nausea, vomiting, loss of appetite. Concentrated essential oil is more dangerous than the plant: cats are especially sensitive to essential oils.
Lobelia Lobelia spp.
Lobeline. Depression, diarrhea, vomiting, drooling, abdominal pain, irregular heart rhythm.
Marjoram and Oregano Origanum spp.
Vomiting and diarrhea.
Mistletoe Viscum album, Phoradendron spp.
Vomiting, diarrhea, difficulty breathing, slow heart rate, rarely low blood pressure.
Monstera Monstera deliciosa
Also: Swiss cheese plant, split-leaf philodendronCalcium oxalate crystals. Mouth pain and swelling, drooling, vomiting, difficulty swallowing.
Morning Glory Ipomoea spp.
Vomiting; a large number of seeds can cause hallucinations.
Onion and Garlic Allium spp.
Also: Chives, leeksDestroy red blood cells and cause anemia. Cats are the most sensitive of all domestic animals: poisoning has been reported from less than a teaspoon of cooked onion. Raw, cooked, and dried forms are all dangerous; powder and dried flakes are more concentrated. Vomiting, weakness, pale gums, jaundice, blood in the urine. Signs often appear several days later.
Peace Lily Spathiphyllum spp.
Also: SpathiphyllumInsoluble calcium oxalate crystals: mouth pain and swelling, drooling, vomiting, difficulty swallowing. Not related to true lilies and does not cause kidney failure.
Peony Paeonia spp.
Paeonol. Vomiting, diarrhea, depression.
Periwinkle Vinca minor
Also: Vinca, myrtleAlkaloids. Vomiting, diarrhea, low blood pressure, depression, tremors, seizures, coma, death.
Philodendron Philodendron spp.
Calcium oxalate crystals. Mouth pain and swelling, drooling, vomiting, difficulty swallowing.
Pothos Epipremnum aureum
Also: Golden pothos, devil's ivyCalcium oxalate crystals. Mouth pain and swelling, drooling, vomiting, difficulty swallowing.
Primrose Primula vulgaris
Also: PrimulaMild vomiting.
Privet Ligustrum spp.
Drooling, abdominal pain, diarrhea, depression.
Rhubarb Rheum rhabarbarum
Soluble oxalates, mostly in the leaves and roots. Vomiting, drooling.
Roman Chamomile Anthemis nobilis
Also: English chamomileContact dermatitis, vomiting, diarrhea, loss of appetite, allergic reactions; long-term use can cause a tendency to bleed.
Schefflera Schefflera spp.
Also: Umbrella treeCalcium oxalate crystals. Mouth irritation, drooling, vomiting, difficulty swallowing. Most often it amounts to mild vomiting and diarrhea.
Shamrock Oxalis spp.
Also: Oxalis, wood sorrelSoluble oxalates. Serious effects usually occur only after eating a large amount, in which case kidney failure is possible.
Snake Plant Sansevieria trifasciata
Also: Mother-in-law's tongue, SansevieriaSaponins. Nausea, vomiting, diarrhea.
Spring Crocus Crocus vernus
Also: Dutch crocusNot on the ASPCA list. According to Pet Poison Helpline, it causes drooling, vomiting, loss of appetite, and diarrhea. If you are not sure the plant eaten was not an autumn crocus, take your cat to the vet.
Tarragon Artemisia dracunculus
Essential oils. Mild vomiting and diarrhea.
Tobacco Plant Nicotiana spp.
Also: Flowering tobacco, NicotianaNicotine: first agitation, then depression, vomiting, incoordination, paralysis, possible death.
Tomato Plant Solanum lycopersicum
Solanine in the green parts. Drooling, loss of appetite, severe digestive upset, weakness, dilated pupils, slow heart rate. Ripe fruit is nontoxic.
Tradescantia Tradescantia spp.
Also: Wandering Jew, spiderwort, inch plantCauses dermatitis.
Tulip Tulipa spp.
The bulb contains the most toxins. Vomiting, depression, diarrhea, drooling.
Wisteria Wisteria spp.
Vomiting, sometimes with blood, diarrhea, depression.
Yarrow Achillea millefolium
Also: MilfoilVomiting, diarrhea, increased urination, dermatitis.
ZZ Plant Zamioculcas zamiifolia
Also: Zanzibar gem, ZamioculcasNot on the ASPCA list, and there is little data on cats. It belongs to the same family as monstera and philodendron, so treat it as toxic.
