Denver Plants

Common Houseplants Poisonous to People and Pets

Common name Toxic parts Level
Alocasia  all species Leaves and stems 3
Amaryllis (Hippeastrum) Bulbs 2
Anthurium all species Leaves and plant saps 3 ~ 4
Asparagus Ferns Leaves and plant saps 4
Aralias (Polyscias family) Plant saps 4
Azaleas (Rhododendron) Leaves and flower nectar 3
Cardboard Palm (Zamia) All parts 1 ~ 5
Caladium (All species) Leaves and bulbs 3 ~ 4
Century Plant (Agave) Plant saps 3 ~ 4
Chinese Evergreens  Plant saps 3 ~ 4
Christmas Holly  Leaves and berries 2
Clivia - Kafer Lily All parts 2 ~ 4
Crotons (Codiaeum sp) Leaves and plant saps 2 ~ 3
Cyclamen (All species) Bulbs 3
Daffodils ( Narcissus) Leaves, flowers and bulbs 2
Dumb Cane (Dieffenbachia) Leaves and plant saps 3
English Ivies (Hedera spp) Plant saps and seeds 3
Easter Lilies Leaves and bulbs 5
Euphorbias ~ Poinsettias Milky sap 4
Ficus (All species) Plant saps 4
Fishtail Palm (Caryota) Seeds and plant sap 3 ~ 4
Jerusalem Cherry (Solanum)
Mistletoe (Phoradendron)
Ornamental Pepper  3 ~ 4
Oleander (Nerium) All parts of the plant 1
Oyster Plant (Rhoea) Plant saps 4
Peace Lily (Spathiphyllum) Plant saps 3 ~ 4
Pencil Cactus (Euphorbia) Milky sap 4
Philodendron (All species) Leaves and plant saps 2,3,4
Pothos (Scindapsus) Leaves and plant saps 3 ~ 4
Sago Palm (Cycas revoluta) Seeds
Schefflera  Leaves and plant saps 2 ~ 4
Snake Plant (Sanseveria) Leaves and plant saps 2 ~ 4
String of Pearls (Senecio)
Yew (Podocarpus)

"The Handbook of Poisonous & Injurious Plants" is rich in visual images, emergency medical information, botanical descriptions, and scientific references, is the easiest to use and most comprehensive handbook of its kind available today. It will be of great value to physicians, naturalists, horticulturists, parents of small children, pet owners, and all those who interact with plants and the landscapes -- both indoors and outdoors. This book is designed to become a well-thumbed addition to libraries, classrooms, and personal bookshelves. The authors are to be congratulated for producing such a useful, portable, and elegant guidebook to the plant toxins that are all around us."
- Peter H. Raven, President, Missouri Botanical Garden, St. Louis, MO,

Toxicity levels

1. Highly Toxicity
: If ingested these plants may cause serious illness or death.
2. Low Toxicity
: If ingested these plants may cause minor illnesses such as vomiting or gastro-intestinal problems.
3. Calcium Oxalic acids:
The juice or sap of these plants contains oxalate crystals. These sharp crystals can irritate the skin, mouth, tongue, and throat, resulting in throat swelling, breathing difficulties, burning pain, and stomach discomfort.
4. Skin Irritation
(Low): The sap of these plants may cause a skin rash or irritation. 
5. Can be fatal to cats or other pets.


Denver Plants is providing this list of poisonous house plants as a service to our guests. We do not guarantee the completeness or accuracy of the information on this page. If you have a poisoning emergency please contact the Poison Control Center in your area or call your doctor immediately. 

Houseplant Menu
Houseplant Sponsor
Plant Care eBooks
Clean air report
Houseplant Glossary
Poisonous Houseplants
Houseplant Pest Articles
Foliar Mealy Bugs
Fungus Gnats
Spider Mites
White Fly
Locate a Supplier
For Houseplants
Guest Support
Did you enjoy the House Plant section? Show your support by Clicking here.

Copyright 2003 nSnare Digital Media 
Site design and hosting by
nSnare Digital Media
Questions or comments about this site? 
Contact webmaster @