200 Poisonous Houseplants

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Most of the plants in the photo above are poisonous. Source: www.cursos-de-moda.com

A surprising number of houseplants are poisonous to people and even more are poisonous to pets. Well, I suppose the word “surprising” isn’t all that appropriate, because there are, in fact, hundreds of poisonous plants in our outdoor environment as well. In fact, no matter where you live, you are probably surrounded by poisonous plants. Yes, they’re that common!

20171119A.pngEven many plants with edible parts have poisonous organs: you wouldn’t want to eat anything but fruit from cherry and apple trees, for example, and everything on potato plants is poisonous except the tubers. You really shouldn’t eat any plant (nor feed them to others, especially children) unless you know they are edible.

Which Plants Make the List

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You literally need a guinea pig (or other rodent) to test for plant toxicity. Source: freeclipartimage.com

Determining which plants are poisonous actually turns out to be very difficult. It would simply be unethical to experiment and give plant leaves, stems, fruits, etc. to humans to test their toxicity and although some testing is done with rats, mice and guinea pigs, the results don’t necessarily apply to other species.

What little specialists know about plant toxicity generally has to be derived from actual accidental poisonings. Yet one human might react to plant X and another not. Notably, young children and small pets could be affected by smaller amounts of toxin than an adult or large pet. And even when there is an apparent reaction to a plant, it might not be due to any toxic property of the plant, but to other factors. The “poison” could have come from bacteria, fungus or insect ingested along with the plant, for example, or the reaction could be psychosomatic (people who think they have ingested a poisonous plant often come down with some pretty dramatic symptoms!). Also, some plants can cause allergic reactions in certain individuals, both humans and pets, but that doesn’t mean they are poisonous.

Also, there are many, many plants—some listed below just to be safe—that will only be toxic if a large quantity is consumed. That’s why, for example, I’ve included spinach on the list of poisonous plants, even though you’d have to consume quite a lot of it to make yourself ill. Another example: begonia flowers are generally considered safe to eat as long as you consume no more than a few cupfuls at one time, but can be toxic if consumed in large quantities.

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Most, but not all, euphorbias are poisonous. Source: cdn.shopify.com

Other plants are listed as poisonous largely due to family connections. For example, most toxicologists automatically list all euphorbias (Euphorbia spp.) as toxic, since most have toxic sap … and testing all 5,000 species would be incredibly complicated. Yet there are plenty of exceptions in the genus, including species that are not only nontoxic, but even edible (Euphorbia edulis, for example). Another is the poinsettia (E. pulcherrima), which has only mildly irritating sap and isn’t really toxic to humans, although it is slightly toxic to cats and dogs. Plants in other families, like the Apocynaceae (dogbane family) and the Araceae (phildendron family), are also routinely listed as toxic whether there is any proof or not. For example, Madagascar palm (Pachypodium lamerei), an Apocynaceae, seems to be considered toxic by just about all sources and is so listed here, yet I can find no proof whatsoever that it really is.

And then you have plants associated with known cases of poisoning for which toxicologists have never been able to find the poison involved: lantana (Lantana camara), for example.

The result of all the above is that deciding whether a plant is poisonous or not can be very anecdotal and toxicologists often emit contradictory statements. I used various Web sites and reference books in preparing the list that follows … and they didn’t always agree. In case of doubt, I went with Poisonous Plants, A Handbook for Doctors, Pharmacists, Toxicologists, Biologists and Veterinarians, Second Edition, by Dietrich Frohne and Hans Jürgen Pfänder, Timber Press, Portand, Oregon, 2005.

You Can Touch, But Not Ingest

The vast majority of plants listed here are only poisonous if consumed, although a few have sap that can irritate the skin. Still, it’s best not to rub the sap of any poisonous plant on your skin nor get it in your eyes, just in case! And when you prune a potentially poisonous plant, wear gloves.

People Versus Pets

You’ll notice that, on the list below, there are more plants toxic to pets than to humans. People are very good at digesting complex proteins and alkaloids that can poison dogs, cats, birds, etc. and when we do become poisoned, we usually recover. That’s because we are omnivores and have had millions of years of practice eating just about everything that surrounds us. Cats, on the opposite end of the spectrum, are especially susceptible to toxic plants, more so than dogs, for example. Their highly carnivorous nature means they’re poor at digesting plant materials.

Never feed “people food” to pets: you just never know. Several herbs and fruits humans consume without difficulty are notably toxic to cats and, sometimes, to dogs: mint, parsley, lemon grass, avocados, citrus, grapes, etc.

Which Plants Don’t Make the List

Prickly Plants

Note that I didn’t include plants whose “people problem” is spininess on the list of poisonous plants, even though they can be dangerous for humans and pets for obvious reasons. There are plenty of spiny plants that are actually quite edible once the thorns are removed. Just keep all spiny, prickly plants out of reach of pets and small children, poisonous or not.

Unpalatable Plants

Just because a plant isn’t poisonous per se doesn’t mean it’s edible. There are plenty of non-toxic plants that are simply not good to eat, being either difficult to digest, bitter, unpalatable or simply of no interest to anybody’s taste buds. Among houseplants, African violets, hoyas, peperomias and most ferns fall into the edible but unpalatable category.

Mushrooms

No mushrooms are included on the list below: they simply aren’t plants, plus they’re rarely grown indoors, at least, not on purpose

Plants Sprayed With Pesticides

A perfectly edible plant can be sprayed with a toxic pesticide, making it toxic in its turn, but that’s outside the scope of this article. For example, ornamental peppers (Capsicum ssp.) sold in nurseries are sometimes labeled “not for human consumption,” leading buyers to presume they are toxic. They aren’t (at least not to humans), but are so labeled because they were sprayed with potentially toxic pesticides.

Keep Just About Everything Out of Reach!

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There are all sorts of reasons why you should keep plants out of reach of children and pets! Source: pixdaus

Plants are far from being a common source of poisonings in the home: in fact, they’re in about ninth position. Even when ingested, they’re more likely to make humans feel ill than to kill anyone. Medications, cleaning products, alcohol and pesticides cause far more poisonings and deaths than plants, but that still doesn’t mean that precautions shouldn’t be taken. The basic rule should always be to place plants out of reach of children and pets unless you know they are harmless… and you don’t mind them being damaged! (Read Cats and Houseplants: Not Always a Good Mix for suggestions on keeping plants out of the reach of cats.)

Although plants rarely cause poisoning, they’re often suspected of causing poisoning. In fact, consumption of plants is the third most common reason people contact Poison Control Centers.

Poisonous Plants

The list that follows is a compendium of plants commonly grown indoors that are usually considered to be poisonous.

*Indicates minor toxicity. Still, contact a Poison Control Center or a doctor in case of ingestion.

          Plant                              Poisonous Part                            Keep Away From

  1. Adromischus (Adromischus)*   All parts   Humans, cats, dogs
  2. African boxwood (Myrsine africana)*   Stems and leaves   Humans, cats, dogs
  3. Agave (Agave)*   All parts   Humans, cats, dogs

    20171119F usaloe.com.jpg

    The toxic part of a medicinal aloe leaf is the yellow sap found just inside the outer green rind. The transparent gel in the center can be used safely. Source: usaloe.com

  4. Aloe, medicinal (Aloe vera)*   Sap   Humans, cats, dogs
  5. Amaryllis (Hippeastrum)*   All parts   Humans, cats, dogs
  6. Angel’s trumpet (Brugmansia)   All parts   Humans, cats, dogs
  7. Anthurium (Anthurium)    All parts   Humans, cats, dogs
  8. Aralia, Balfour (Polyscias)*   All parts   Humans, cats, dogs
  9. Aralia, Ming (Polyscias)*   All parts raw (edible cooked)   Humans, cats, dogs
  10. Arrowhead plant (Syngonium)    All parts   Humans, cats, dogs
  11. Aucuba, Japanese (Aucuba)*   All parts, especially berries   Humans, cats, dogs

    20171119G M.t.lifshits.JPG

    The avocado is safe for human, but toxic to pets. Source: M.t.lifshits

  12. Avocado (Persea americana)   Leaves, stems, pit   Cats
  13. Azalea (Rhododendron)   All parts   Humans, cats, dogs
  14. Bamboo, heavenly (Nandina)   All parts   Humans, cats, dogs
  15. Bamboo, lucky (Dracaena)   All parts   Cats, dogs
  16. Bay leaf, bay laurel (Laurus nobilis)   Leaves   Cats, dogs
  17. Begonia (Begonia)*   Tubers, rhizomes, sometimes flowers or leaves   Humans, cats, dogs
  18. Bird of paradise (Strelitzia)   Leaves, flowers, seeds   Cats, dogs
  19. Blindness tree (Excoecaria cochinchinensis)  All parts, including sap   Humans, cats, dogs
  20. Blue chalk sticks (Senecio)*   All parts   Humans, cats, dogs
  21. Bottle tree (Brachychiton)*   All parts   Humans, cats, dogs
  22. Bougainvillea (Bougainvillea)   Sap, thorns   Humans, cats, dogs
  23. Bow string hemp (Sansevieria)*   All parts   Humans, cats, dogs
  24. Boxwood (Buxus)   All parts   Humans, cats, dogs

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    Beautifully scented, brugmansia is nevertheless highly toxic. Source: Rob Hille

  25. Brugmansia (Brugmansia)   All parts   Humans, cats, dogs
  26. Bushman’s poison (Acokanthera)   All parts   Humans, cats, dogs
  27. Butterfly weed (Asclepias)*   All parts   Humans, cats, dogs
  28. Cabbage tree, cabbage palm (Cordyline australis)   All parts   Cats, dogs
  29. Cactus (a few species, like Lophophora williamsii)   Sap   Humans, cats, dogs
  30. Caladium (Caladium)*   All parts   Humans, cats, dogs
  31. Calla lily (Zantedeschia)   All parts   Humans, cats, dogs
  32. Calomondin orange (× CItrofortunella microcarpa)   All parts including fruit   Cats, dogs
  33. Camphor tree (Cinnamomum camphorum)*   All parts   Humans, cats, dogs
  34. Castor bean (Ricinus communis)   All parts   Humans, cats, dogs
  35. Century plant (Agave)*   All parts   Humans, cats, dogs
  36. Cestrum (Cestrum)*   All parts   Humans, cats, dogs
  37. Chenille plant (Acalypha)*   All parts   Humans, cats, dogs

    20171119I Paul Venter.jpg

    Young children could easily mistake Jerusalem cherry fruits for candies. Source: Paul Venter

  38. Cherry, Jerusalem (Solanum pseudocapsicum)   All parts   Humans, cats, dogs
  39. Chinese evergreen (Aglaonema)*   All parts   Humans, cats, dogs
  40. Chrysanthemum (Chrysanthemum)*   All parts   Humans, cats, dogs
  41. Cineraria (Senecio, Pericallis)*   All parts   Humans, cats, dogs
  42. Citrus (Citrus)*   All parts, including fruit   Cats, dogs
  43. Clematis (Clematis)*   All parts   Humans, cats, dogs
  44. Clementine (Citrus)*   All parts, including fruit  Cats, dogs
  45. Clivia (Clivia)*   All parts   Humans, cats, dogs
  46. Coffee plant (Coffea arabica)*   All parts except mature fruit   Humans, cats, dogs
  47. Colchicum (Colchicum)   All parts   Humans, cats, dogs
  48. Copperleaf (Acalypha)*   All parts   Humans, cats, dogs
  49. Coral plant (Jatropha)*   All parts, especially seeds   Humans, cats, dogs
  50. Coral tree (Erythrina)   All parts   Humans, cats, dogs
  51. Corn plant (Dracaena fragrans)   All parts   Cats, dogs
  52. Cotyledon (Cotyledon)*   All parts   Humans, cats, dogs
  53. Crassula (Crassula)*   All parts   Humans, cats, dogs
  54. Crinum (Crinum)*   All parts   Humans, cats, dogs

    20171119J Forest  & Kim Starr, WC.jpg

    The croton’s colorful leaves are also a bit toxic. Source: Forest & Kim Starr, Wikimedia Commons

  55. Croton (Codiaeum)*   All parts   Humans, cats, dogs
  56. Croton, Chinese (Excoecaria cochinchinensis)  All parts, including sap   Humans, cats, dogs
  57. Crown of thorns (Euphorbia)   All parts   Humans, cats, dogs
  58. Cyclamen (Cyclamen)*   All parts, especially corm   Humans, cats, dogs
  59. Cypripedium (Cypripedium)*   Leaves   Humans, cats, dogs
  60. Daffodil (Narcissus)*   All parts   Humans, cats, dogs
  61. Daffodil, Peruvian (Hymenocallis)*   All parts   Humans, cats, dogs
  62. Dahlia (Dahlia)   All parts   Cats, dogs
  63. Daisy, Paris (Argyranthemum)*   Leaves, stems   Humans, cats, dogs
  64. Datura (Datura)   All parts   Humans, cats, dogs
  65. Devil’s backbone (Euphorbia tithymaloides, formerly Pedilanthus tithymaloides)   All parts   Humans, cats, dogs

    20171119J Jerzy Opioła.jpg

    The dieffenbachia is well know to have toxic sap. Source: Jerzy Opiola

  66. Dieffenbachia (Dieffenbachia)   All parts   Humans, cats, dogs
  67. Dipladenia (Mandevilla)*    All parts   Humans, cats, dogs
  68. Dracaena (Dracaena)   All parts   Cats, dogs
  69. Dragon tree (Dracaena)   All parts   Cats, dogs
  70. Dumbcane (Dieffenbachia)   All parts   Humans, cats, dogs
  71. Duranta (Duranta spp.)   Leaves, berries   Humans, cats, dogs
  72. Dusty miller (Senecio cineraria)*   All parts   Humans, cats, dogs
  73. Elephant’s ear (Alocasia)   Leaves, stems, roots   Humans, cats, dogs
  74. Elephant’s ear (Colocasia)   All parts   Humans, cats, dogs
  75. Elephant’s ear (Xanthosoma)   All parts   Humans, cats, dogs
  76. Eucalyptus (Eucalyptus)   All parts   Humans, cats, dogs
  77. Euonymus (Euonymus sap.)*   All parts, especially berries  Humans, cats, dogs
  78. Euphorbia (Euphorbia, most species)   All parts   Humans, cats, dogs
  79. Fern, asparagus (Asparagus)   All parts, especially berries   Humans, cats, dogs
  80. Fiber-optic plant (Isolepis cernua, syn. Scirpus cernuus)*   Young shoots   Humans, cats, dogs

    20171119M execuflora.co.za.jpg

    There are many species of indoor fig, including this Ficus mclellandii ‘Alii’. All have somewhat toxic sap than can cause skin irritation. Source: execuflora.co.za

  81. Ficus (Ficus)   Sap   Humans, cats, dogs
  82. Fig (Ficus)   Sap   Humans, cats, dogs
  83. Gardenia (Gardenia)   All parts   Cats, dogs
  84. Geranium (Pelargonium)   All parts   Cats, dogs
  85. Golden dewdrops (Duranta spp.)   Leaves, berries   Humans, cats, dogs
  86. Golden trumpet vine (Allamanda cathartica)*    All parts   Humans, cats, dogs
  87. Grape vine (Vitis)   Fruit   Cats, dogs
  88. Grapefruit (Citrus)*   All parts, including fruit  Cats, dogs
  89. Heather (Calluna, Erica)   All parts   Humans, cats, dogs
  90. Heather, false (Cuphea hyssopifolia)   All parts   Humans, cats, dogs
  91. Heliotrope (Heliotropium)   Seeds   Humans, cats, dogs
  92. Holly (Ilex)*   Berries    Humans, cats, dogs
  93. Homalomena (Homalomena)*   All parts   Cats, dogs
  94. Hortensia (Hydrangea)   All parts   Humans, cats, dogs
  95. Hyacinth (Hyacinthus)*   All parts   Humans, cats, dogs
  96. Ismene, Peruvian daffodil (Hymenocallis)*   All parts   Humans, cats, dogs
  97. Ivy (Hedera)   All parts   Humans, cats, dogs
  98. Ivy, Cape (Senecio macroglossus)*   All parts   Humans, cats, dogs

    20171119M giftshops.via-christi.org.jpg

    English ivy (Hedera helix) is a popular trailing houseplant that is toxic in all its parts. Source: giftshops.via-christi.org

  99. Ivy, English (Hedera helix)   All parts   Humans, cats, dogs
  100. Ivy, German (Senecio mikanioides)*   All parts   Humans, cats, dogs
  101. Ivy, ground (Glechoma hederacea)*   All parts   Humans, cats, dogs
  102. Jade plant (Crassula)*   All parts   Humans, cats, dogs
  103. Jessamine, Carolina (Gelsemium sempervirens)   All parts   Humans, cats, dogs
  104. Jessamine, night-blooming (Cestrum)*   All parts   Humans, cats, dogs
  105. Jonquil (Narcissus)*   All parts   Humans, cats, dogs
  106. Juniper (Juniperus)*   Leaves   Humans, cats, dogs
  107. Kalanchoe (Kalanchoe)   All parts   Humans, cats, dogs
  108. Lantana (Lantana)   All parts, especially unripe berries   Humans, cats, dogs
  109. Lavender (Lavandula)   All parts   Cats, dogs
  110. Lemon (Citrus)*   All parts, including fruit   Cats, dogs

    20171119M amazon.com.jpg

    Lemon grass is edible for humans, toxic for cats and dogs. Source: amazon.com

  111. Lemon grass (Cymbopogon)   All parts   Cats, dogs
  112. Lemon verbena (Aloysia triphylla)   All parts   Cats, dogs
  113. Lily (Lilium)   All parts   Cats
  114. Lily-of-the-valley (Convallaria)   All parts   Humans, cats, dogs
  115. Lily, Aztec (Sprekelia)   All parts   Humans, cats, dogs
  116. Lily, blood (Haemanthus)* All parts   Humans, cats, dogs
  117. Lily, calla (Zantedeschia)   All parts   Humans, cats, dogs
  118. Lily, Easter (Lilium longiflorum)   All parts   Cats
  119. Lily, glory (Gloriosa)   All parts   Humans, cats, dogs
  120. Lily, Guernsey (Nerine)* All parts   Humans, cats, dogs
  121. Lily, impala (Adenium obesum)   All parts   Humans, cats, dogs
  122. Lily, Inca (Alstroemeria)*   All parts   Humans, cats, dogs
  123. Lily, Nile, lily of the Nile (Agapanthus)*   All parts   Humans, cats, dogs
  124. Lily, peace (Spathiphyllum)   All parts   Humans, cats, dogs
  125. Lily, spider (Hymenocallis)*   All parts   Humans, cats, dogs
  126. Lime (Citrus)*   All parts, including fruit  Cats, dogs
  127. Mandarin orange (Citrus)*   All parts, including fruit  Cats, dogs
  128. Mandevilla (Mandevilla)*    All parts   Humans, cats, dogs

    what-does-on-gram-of-cannabis-look-like-a-visual-guide-to-cannabi-480x300.jpg

    Chewing on cannabis leaves dans make pets and young children very ill. Source: www.leafly.com

  129. Marijuana (Cannabis)*   All parts   Humans, cats, dogs
  130. Milk bush, African (Euphorbia umbellata, syn. Synadenium grantii)    All parts   Humans, cats, dogs
  131. Mint (Mentha)*   All parts   Cats, dogs
  132. Mint, Mexican (Plectranthus amboinicus)   All parts   Cats, dogs
  133. Mistletoe (Viscum, Phoradendron)   All parts   Humans, cats, dogs
  134. Monadenium (Monadenium)   All parts   Humans, cats, dogs
  135. Morning glory (Ipomoea, most species)   All parts   Cats, dogs
  136. Moses-in-the-cradle (Tradescantia spathacea, formerly Rhoeo spathacea)*   Sap   Humans, cats, dogs
  137. Mother-in-law’s tongue (Sansevieria)*   All parts   Humans, cats, dogs
  138. Myrtle (Myrtus communis)*   Leaves   Humans, cats, dogs
  139. Narcissus (Narcissus)*   All parts   Humans, cats, dogs

    20171119N Forest & Kim Starr, WC.jpg

    Ripe fruits of Natal plum are edible; all other parts are toxic. Source: Forest & Kim Starr, Wikimedia Commons

  140. Natal plum (Carissa macrocarpa)   Leaves, flowers, unripe fruit   Humans, cats, dogs
  141. Nightshade (Solanum)   All parts   Humans, cats, dogs
  142. Norfolk Island pine (Araucaria heterophylla)   All parts   Cats, dogs
  143. Oleander (Nerium)   All parts   Humans, cats, dogs
  144. Oleander, yellow (Thevetia)   All parts   Humans, cats, dogs
  145. Orange (Citrus)*   All parts, including fruit  Cats, dogs
  146. Oregano, Cuban (Plectranthus amboinicus)   All parts   Cats, dogs
  147. Oxalis (Oxalis)*   All parts   Cats, dogs
  148. Palm, cardboard (Zamia)   All parts   Humans, cats, dogs
  149. Palm, fishtail (Caryota)*   All parts, especially fruits   Humans, cats, dogs
  150. Palm, Madagascar (Pachypodium)   All parts   Humans, cats, dogs

    20171119O www.exotenherz.de.jpg

    Properly prepared, sago is a staple food in some countries, but raw, all the parts of the so-called sago palm are toxic. Source: www.exotenherz.de

  151. Palm, sago (Cycas revoluta)   All parts   Humans, cats, dogs
  152. Pandanus (Pandanus)*   All parts   Humans, cats, dogs
  153. Paperwhite (Narcissus)*   All parts   Humans, cats, dogs
  154. Parsley (Petroselinum crispum)*   All parts   Cats, dogs
  155. Pélargonium (Pelargonium)   All parts   Cats, dogs
  156. Pencil tree (Euphorbia tirucalli)   All parts   Humans, cats, dogs
  157. Pepper, ornamental (Capsicum)   Fruits   Cats, dogs
  158. Philodendron (Philodendron)   All parts   Humans, cats, dogs
  159. Philodendron, split-leaf (Monstera)   Leaves, stem, unripe fruit   Humans, cats, dogs
  160. Pine, Buddhist (Podocarpus)*   All parts   Humans, cats, dogs
  161. Pineapple (Ananas)*   Sap, unripe fruit   Humans, cats, dogs
  162. Plumbago, Cape (Plumbago auricula)*   Sap   Humans, cats, dogs
  163. Plumeria (Plumeria)   All parts   Humans, cats, dogs
  164. Podocarpus (Podocarpus)*   All parts   Humans, cats, dogs

    20171119P growerdirect.com:.jpg.jpg

    The poinsettia is harmless to people, but its sap is somewhat toxic to pets. Source: growerdirect.com

  165. Poinsettia (Euphorbia pulcherrima)*   Sap   Cats, dogs
  166. Pothos (Epipremnum, Scindapsus)   All parts   Humans, cats, dogs
  167. Powder puff tree (Calliandra)   All parts  Humans, cats, dogs
  168. Pregnant onion (Albuca bracteata, formerly Ornithogalum caudatum)   All parts   Humans, cats, dogs
  169. Primrose (Primula)   Leaves   Humans, cats, dogs
  170. Ranunculus (Ranunculus asiaticus)*   All parts   Humans, cats, dogs
  171. Rhododendron (Rhododendron)   All parts   Humans, cats, dogs
  172. Ribbon plant (Dracaena)   All parts   Cats, dogs
  173. Rose, Christmas (Helleborus)   All parts   Humans, cats, dogs
  174. Rose, desert (Adenium obesum)   All parts   Humans, cats, dogs
  175. Rose, Lenten (Helleborus)   All parts   Humans, cats, dogs
  176. Rubber plant (Ficus elastica)*   Sap   Humans, cats, dogs
  177. Rush (Juncus effusus)*   Young shoots   Humans, cats, dogs
  178. Schefflera (Schefflera)*   All parts   Humans, cats, dogs

    20171119P JJ Harrison, WC.jpg

    Sedums (here, Sedum rubrotinctum) are complicated when it comes to toxicity. Some are slightly toxic, others not at all. Still, it’s best to keep them away from small children and pets. Source: JJ Harrison, Wikimedia Commons

  179. Sedum (Sedum, some species)*   All parts   Humans, cats, dogs
  180. Senecio (Senecio, succulent species)*   All parts   Humans, cats, dogs
  181. Sensitive plant (Mimosa pudica)*   All parts   Cats, dogs
  182. Shamrock plant (Oxalis)*   All parts   Cats, dogs
  183. Silk oak (Grevillea)*   All parts   Humans, cats, dogs
  184. Snake plant (Sansevieria)*   All parts   Humans, cats, dogs
  185. Spathiphyllum (Spathiphyllum)   All parts   Humans, cats, dogs
  186. Spiderwort (Tradescantia)*   All parts   Humans, cats, dogs
  187. Spinach (Spinacia oleracea)*   Leaves   Humans, cats, dogs
  188. Squill, Peruvian (Scilla peruviana)   All parts   Humans, cats, dogs
  189. Squill, silver (Ledbouria socialis)   All parts   Humans, cats, dogs
  190. Star-of-Bethlehem (Ornithogalum, some species)   All parts   Humans, cats, dogs
  191. String-of-beads (Senecio rowleyanus)*   All parts   Humans, cats, dogs

    20171119Q shopping.rediff.com.jpg

    Tangerines and other citrus are somewhat toxic to dogs, more seriously so to cats. This includes not only fruit, but leaves, stems, flowers, etc. Source: shopping.rediff.com

  192. Tangerine (Citrus)*   All parts, including fruit  Cats, dogs
  193. Taro (Calocasia)   All parts   Humans, cats, dogs
  194. Thyme, Spanish (Plectranthus amboinicus)   All parts   Cats, dogs
  195. Ti plant (Cordyline fruticosa, syn. C. terminalis)   All parts   Cats, dogs
  196. Tulip (Tulipa)*   Uncooked bulbs   Humans, cats, dogs
  197. Tylecodon (Tylecodon)*   All parts   Humans, cats, dogs
  198. Umbrella plant (Cyperus alternifolius)*   All parts   Humans, cats, dogs
  199. Umbrella tree (Schefflera)*   All parts   Humans, cats, dogs
  200. Wandering jew (Tradescantia)*   All parts   Humans, cats, dogs
  201. Yesterday, today and tomorrow (Brunfelsia)   All parts   Dogs
  202. Yucca (Yucca)*   All parts except flowers (safe for humans)   Humans, cats, dogs
  203. ZZ plant (Zamioculcas zamiifolia)*    All parts   Humans, cats, dogs

Safe Houseplants

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Many houseplants are safe for children and pets.

The above list can appear pretty scary, but if you read the text from the beginning, you’ll understand that poisonings due to plants are very rare indeed. Even so, if you want to take no chances, here is a list of houseplants you can safely grow even when you have small children, cats and dogs: Nontoxic Houselants for Kids, Cats and Dogs.20171119B ENG

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5 thoughts on “200 Poisonous Houseplants

  1. SCMGA

    I think you have a money making option here – an app for their smart phone that reminds people not to eat their house plants. 🙂

    • This is one of the complicated situations where a plant is poisonous raw, but edible cooked. For the purposes of this article, which is about houseplants, not cooking, I felt it was safest to include plants that are poisonous raw on the list.

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