The following list of harmful plants comes from an article published in KOI USA several years ago.
Plant
Poisonous Part
Amaryllis
Bulbs
Azalea
Leaves
Balsam Pear
Seeds, outer rind of fruit
Baneberry
Berries, roots
Bird of Paradise
Seeds
Black Locust
Bark, sprouts, foliage
Blue-Green Algae
Some forms toxic
Boxwood
Leaves, stems
Buckthorn
Fruit, bark
Buttercup
Sap, bulbs
Caladium
Leaves
Calla Lily
Leaves
Castor Bean (Castor Oil)
Beans, Leaves
Challice Vine
All parts
Cherry Tree
Bark, twigs, leaves, pits
Christmas Candle
Sap
Coral Plant
Seeds
Daffodil
Bulbs
Daphne
Berries
Datura
Berries
Deadly Amanita
All parts
Death Camas
All parts
Deiffenbachia
Leaves
Delphinium
All parts
Eggplant
All parts but fruit
Elephant's Ear (Taro)
Leaves, stem
English Ivy
Berries, leaves
False Henbane
All parts
Foxglove
Leaves, seeds
Golden Chain
All parts, especially seeds
Hemlock, Poison
All parts, especially roots and seeds
Hemlock, Water
All parts, especially roots and seeds
Henbane
Seeds
Holly
Berries
Horse Chestnut
Nuts, twigs
Hyacinth
Bulbs
Hydrangea
Flower bud
Indian Turnip (jack-in-the-pulpit)
All parts
Iris (Blue Flag)
Bulbs
Java Bean (Lima)
Uncooked bean
Jerusalem Cherry
Berries
Jimsonweed
Leaves, seeds
Juniper ( J. virginiana)
Needles, stems, berries
Lantana
Immature berries
Larkspur
All parts
Laurel
All parts
Lily of the Valley
All parts, including water
Lobelia
All parts
Locoweed
All parts
Lords and Ladies
All parts
Marijuana
Leaves
Mayapple
All parts, except fruit
Mescal Bean
Seeds
Mistletoe
Berries
Mock Orange
Fruit
Monkshood
Leaves, roots
Morning Glory
All parts
Narcissus
Bulbs
Nightshades (All)
Berries, leaves
Oak
Acorns, foliage
Oleander
Leaves, branches, nectar of blossoms
Philodendron
Leaves, stem
Pikeweed
Leaves, roots, immature berries
Poinsettia
Leaves, flowers
Poison Ivy
Sap
Poison Oak
Sap
Potato
Eyes and new shoots
Privet
All parts, including berries
Rhododendron
All parts
Rhubarb
Leaves
Rosary Peas
Seeds
Skunk Cabbage
All parts
Snow on Mountain
All parts
Snowdrop
All parts, especially buds
Sweet Pea
Seeds and fruit
Tobacco
Leaves
Virginia Creeper
Sap
Wisteria
All parts
Yam Bean
Roots, immature pods
Yew (American, English, Japanese)
Needles, seeds

 


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