Plants that are Toxic to Your Pets
The ASPCA Animal Poison Control Center says the following plants have been identified as being dangerous for your pets.
Plants that affect your pet's heart if ingested:Convallaria majalis - Lily of the Valley; Nerium oleander - Oleander; Rhododendron species - Rhododendron, Azalea and Rosebay; Taxus species - American, Japanese, English and Western Yew; Digitalis purpurea - Foxglove; Kalanchoe spp. - Kalanchoe.
Plants in this list could cause kidney failure if ingested: Certain species of lilies (in cats only); Rhubarb (Rheum species) - leaves only.
These plants could cause liver failure: Cycads (Cycad species); Mushroom (Amanita phalloides).
The plants in this list could have multiple effects on your pet: Autumn Crocus (Colchicum species) (Hemorrhagic gastroenteritis, renal, liver damage and bone marrow suppression); Castor Bean (Ricinus species) (Can cause renal failure, convulsions and death)
Mushrooms should always be considered toxic to your pet unless they have been identified by a mycologist.