The flowers and plants listed here are typically the most common ones used in gardening. See more at the ASPCA 's Animal Poison Control Center.
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Poisonous plants that can potentially kill your pet or cause serious damage:
Azalea
Contains grayanotoxin, which causes cardiovascular collapse. Photo from Depositphotos
Castor Bean Plant and Beans
Castor bean plants and their beans cause convulsions, kidney failure, and rapid death. Photo by Depositphotos
Castor Beans
The brown castor beans, which are commonly made into necklaces, are also extremely lethal if chewed up. Photo by Depositphotos
Cyclamen
Causes heart arrhythmias if the root/tuber is eaten in large quantities, otherwise just upset stomach. Photo from Depositphotos
Daffodil
Daffodils, especially the bulb, causes convulsions, tremors and heart arrhythmia. Photo by Karen James/VIN.
Easter Lily
Causes kidney failure in cats. Photo by Depositphotos
Foxglove
Poisons the heart. Photo by Depositphotos
Oleander
Poisons the heart. Photo by Depositphotos
Sago Palm
Causes liver failure and interferes with blood clotting. Sago palms are often used as potted plants as well as planted outdoors. Photos by Depositphotos.
Star Gazer Lily
Photo from Depositphotos
Tiger Lily
Some tiger lilies have spots. Other daylilies as shown above also cause kidney failure in cats. Photo from Depositphotos
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Toxic plants that are not dangerous, but may make your pet sick:
Aloe Vera
Causes upset stomach, can also cause tremors. Photo by Depositphotos
Begonia
Oxalate crystals in the plant embed in the mouth causing pain and inflammation. Photo by Depositphotos
Bird of Paradise
Upset stomach and drowsiness. Photo courtesy of Depositphotos
Bougainvillea
Photo by Dr. Teri Ann Oursler
Calla Lily
Photo courtesy of Depositphotos
Carnation
Carnations cause an upset stomach. Photo courtesy of Depositphotos
Chrysanthemum
Causes upset stomach, drooling, incoordination. Photos by Depositphotos.
Coleus
Causes vomiting/diarrhea either of which can be bloody. Photo by Depositphotos
Cosmos
Can cause gastrointestinal upset.
Photo by Depositphotos
Daisy
Signs include Vomiting, diarrhea, hypersalivation, incoordination, dermatitis.
Photo by Depositphotos
Dumb Cane
Photo by Depositphotos
Elephant Ear Plant
Causes intense burning of the mouth and vomiting.
Photo by Depositphotos
Fleabane
Causes upset stomach.
Photo by Depositphotos
Gardenia
Causes upset stomach and hives.
Photo by Depositphotos
Geranium (maroon)
Photo by Dr. Teri Ann Oursler
Hibiscus
Causes upset stomach & appetite loss.
Photo by Depositphotos
Hydrangea
Photo by Depositphotos
Iris
Causes upset stomach. The bulb is the most toxic part.
Photo by Depositphotos
Kalanchoe
Causes gastrointestinal upset and rarely heart rhythm disturbance.
Photo by Depositphotos
Mother-in-law's Tongue
Photo by Depositphotos
Pansy
Causes gastrointestinal upset.
Photo courtesy of Depositphotos
Peace Lily
Photo by Depositphotos
Dianthus (also called Sweet William)
Dianthus causes upset stomach and dermatitis.
Photo by Depositphotos
Plumbago
Plumbago causes contact dermatitis and makes skin more sensitive to sun exposure.
Photo by Depositphotos
Poinsettia
Causes mouth irritation and upset stomach.
By http://www.ars.usda.gov/is/graphics/photos/k7244-2.htm,
Public Domain.
Primrose
Primrose causes mild upset stomach.
Photo by Depositphotos
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Plants that are safe for your pet:
Alyssum
Photo by Depositphotos
Blue Daisy
Boston Fern
Photo courtesy of Depositphotos
Bottle Brush Flower
Photo Courtesy Dr. Teri Ann Oursler
Camelia
Photo by Depositphotos
Canna Lily
Photo by Depositphotos
Catnip (Nepeta cataria)
Photo by Depositphotos
Celosia plumosa
Photo courtesy Depositphotos
Christmas Cactus
Photo by Depositphotos
Coreopsis
Photo by Depositphotos
Echeveria Succulents
Photos by Depositphotos
Gerber Daisy
Photos by Depositphotos
Gloxinia
Courtesy of Depositphotos
Impatiens
Courtesy of Depositphotos
Marigolds
Courtesy of Depositphotos
Nasturtiums
Courtesy of Depositphotos
Pampas Grass
Courtesy of Depositphotos
Persian Violet
Courtesy of Depositphotos
Petunia
Photo by Dr. Teri Ann Oursler
Polka Dot Plant
Can cause mild vomiting and diarrhea. Also called Measles Plant, Baby’s Tears, Freckle Face.
Photo couresty of Depositphotos
Roses
Courtesy of Depositphotos
Snapdragons
Photo courtesy of Depositphotos
Spider Plant
Courtesy of Depositphotos
Star Jasmine
Courtesy of Depositphotos
Sunflowers
Courtesy of Depositphotos
Sword Fern
Courtesy of Depositphotos
Violet
Courtesy of Depositphotos
Zinnia
Courtesy of Depositphotos