Plants that Poison

House Plants
Plant Toxic Part Symptoms
Hyacinth, Narcissus, Daffodil Bulbs Nausea, Vomiting, Diarrhea
Oleander All Parts Affects the heart, produces severe digestion upset
Dieffenbachia (Dumb Cane) & Philodendron All Parts Intense burning and
irritation of the mouth and tongue. Base of tongue may swell enough to block the air passage
of the throat.
Rosary Pea, Castor Bean Seeds Burning sensation in
mouth and throat, nausea, vomiting,diarrhea,and excessive thirst. Can cause convulsions
and uremia
Poinsettia Leaves Not as toxic as originally stated
Mistletoe All Parts Mild intestinal irritation and diarrhea

Flower Garden Plants
Plant Toxic Part Symptoms
Larkspur Young plant, Seeds Digestive upset, nervous excitement, depression
Monkshood Fleshy Roots Digestive upset, nervous excitement
Autumn Crocus, Star of Bethlehem Bulbs Vomiting and nervous excitement
Lily of the Valley Leaves, Flowers Irregular heart beat and pulse, usually accompanied
by digestive upset and mental confusion
Lily Leaves, Flowers, Pollen Kidney failure in cats if any part of plant is ingested
Iris Underground Stems Produces nausea, abdominal pain and vomiting
Foxglove Leaves One of the sources of the drug digitalis, used to
stimulate the heart. In large amounts, the active principals cause digestive upset, mental
confusion and dangerous irregular heartbeat and pulse
Bleeding Heart Foliage, Roots May cause convulsions and difficult breathing when
eaten in large quantities
Sweet Pea Seeds If eaten in large quantities, can produce paralytic

Vegetable Garden Plants
Plant Toxic Part Symptoms
Rhubarb Leaf Blade Large amounts of raw or cooked leaves can cause
convulsions, coma
Potato Sprouts, Foliage Digestive Upset Green Potato Skin
Tomato Leaves Cardiac Depression

Ornamental Plants
Plant Toxic Part Symptoms
Daphne All Parts, especially the berries Burning sensation in mouth and throat, can cause
gastro-intestinal irritation, internal bleeding and bloody diarrhea
Wisteria Seeds, Pods Mild to severe digestive upset
Golden Chain Bean-like capsules where seeds
are suspended
Excitement, staggering, convulsions and coma
Laurels, Rhododendron, Azaleas All Parts Produces nausea and vomiting, depression
difficult breathing, prostration and coma
Yew Berries, Foliage Diarrhea, trembling, muscular weakness, difficult breathing.
Rapid collapse can occur if eaten in quantity
Magnolia Flower Headache and depression

Trees and Shrubs
Plant Toxic Part Symptoms
Wild and Cultivated Cherry Twigs and Foliage Contains a compound that releases cyanide when
eaten. Gasping, excitement, and prostration are common symptoms that often appear in minutes
Oaks Foliage, Acorns Affects the kidney gradually. Symptoms appear
only after several days or weeks. Take a large amount for poisoning
Elderberry Shoots,Leaves,Bark Children have been poisoned by using pieces of
the pithy stems for blowguns. Nausea and digestive upset
Black Locust Bark,Sprouts,Foliage Children have suffered nausea,weakness and
depression after chewing the bark and seeds
Holly Berries Vomiting and diarrhea may occur depending on
types of holly and its maturation

Wild Plants
Plant Toxic Part Symptoms
Mayapple Apple,
Foliage, Roots
Contains at least 16 active toxic principals,
primarily in the roots. Children often eat the apple with no ill effects but several apples may cause
Skunk Cabbage Leaves, Rootstalk Burning and swelling of mouth, tongue and throat
Water Hemlock All Parts, especially the tubers Diarrhea, violent and painful convulsions
Buttercups All parts Irritant juices may severely irritate the digestive
Nightshade All Parts, especially
the unripe berry
American nightshade may lead to intense
digestive disturbances while English deadly
nightshade strikes the nervous system
Poison Hemlock All Parts The tuber resembles a large wild carrot. Nausea
vomiting and convulsions may occur
Jimson Weed (Thorn Apple) All Parts Abnormal thirst, distort sight, delirium, incoherence
and coma


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