List of Poisonous Plants

Important: If someone has been exposed to a potentially harmful plant, or you have additional questions, please call your poison control center at 800-222-1222.

Disclaimer: The information on this website is not intended to be comprehensive. It is a compilation of the plants most frequently encountered by the Utah Poison Control Center (UPCC). The UPCC staff have tried to provide the most accurate information possible, however, we do not claim that this website is error-free.

This project is supported by funds received through grant # H4B HS 00 008 awarded by the Department of Health and Human Services, Health Resources and Services Administration. Its contents are solely the responsibility of the authors and do not necessarily represent the official views of the Health Resources and Services Administration, Division of Healthcare Preparedness, Healthcare Systems Bureau.

Thumbnail Common Name
(Scientific Name)
Type Description
Baneberry (Actaea rubra) Baneberry
(Actaea rubra)
Native These plants grow at higher elevations (8000 feet) in cool, wet places. Grows 3 or 4 feet tall, has a thick stem and thick underground root, large featherlike leaves with a hairy underside. Poisonous parts: all parts, especially root stock and sap.
Calla Lily (Zantedeschia species) Calla Lily
(Zantedeschia species)
Houseplant Leaves shaped like arrow heads that may grow to 18 inches long and 10 inches wide. Leaves are glossy green. Stems are longer than the actual leaves. Spathe-shaped white flowers. Berry is not often seen.
Castor Bean (Ricinus communis) Castor Bean
(Ricinus communis)
Cultivated Usually grown as an annual. May grow 6-15 feet tall. Leaves alternate and may be up to 3 feet in diameter. Leaves are lobed and have 5-11 points.
Cotoneaster (Cotoneaster species) Cotoneaster
(Cotoneaster species)
Cultivated May be ground cover to small upright shrub to very tall graceful shrubs (25 feet). Flowers are white or pinkish and bloom in Spring. They resemble tiny single roses. Berries may be red or orange-red.
Daffodil (Narcissus species) Daffodil
(Narcissus species)
Cultivated Common garden plant grown from bulbs usually with straight, flat leaves and white or yellow flowers.
Deadly Nightshade (Solanum Dulcamara) Deadly Nightshade
(Solanum Dulcamara)
Native Vine-like plant that may grow as high as 6 feet.
Death Camus (Zigadenus species) Death Camus
(Zigadenus species)
Native Perennial herb with narrow, grass-like leaves. Yellow or whitish-green flowers form at top of central stalk. Bulbs often mistaken for onion but lack the characteristic onion odor.
Donkey's tail, creeping spurge, myrtle spurge (Euphorbia myrsinites) Donkey's tail, creeping spurge, myrtle spurge
(Euphorbia myrsinites)
Native Grows wild in foothill areas in northeastern Utah, also cultivated in rock gardens. Blue-green diamond-shaped fleshy leaves in close spiral arrangement, end with a tooth-like tip.
Dumb Cane (Dieffenbachia species) Dumb Cane
(Dieffenbachia species)
Houseplant House plant that has large leaves up to 20 inches. The plant may reach 2 feet in width. It is generally taller than it is wide. Leaves are dark green to yellow green with variegations in white or pale cream.
Easter Lily (Lilium longiflorum) Easter Lily
(Lilium longiflorum)
Houseplant Leaves are shiny, dark-green and lance shaped. Flowers are white and trumpet-like.
False Hellebore (Veratrum species) False Hellebore
(Veratrum species)
Native Grows in damp areas on meadows and hillsides at high elevations. It emerges as soon as snow melts in the Spring and reaches a height of 1.5 to 2 meters. Leaves may measure 20 to 30 cm long and 7 to 15 cm broad. Cream-colored flowers grow in clusters at the top of a single unbranched stalk that resembles corn.
Firethorn (Pyracantha species.) Firethorn
(Pyracantha species.)
Cultivated Habit ranges from upright to sprawling. Glossy green oval shaped leaves. Has needle-like thorns. Planted as shrubs or ground covers in full sun.
Foxglove (Digitalis purpurea) Foxglove
(Digitalis purpurea)
Cultivated Cultivated in gardens throughout the United States. Grows up to 4 feet tall. Leaves are grayish-green in color and are wooly on their underside.
Iris (Iris species) Iris
(Iris species)
Cultivated Sword or grass-like leaves with showy flowers that bloom in Spring or early summer. They grow from bulbs or rhizomes, 1 to 2 feet tall.
Jimson Weed (Datura Wrightii) Jimson Weed
(Datura Wrightii)
Native Can grow up to 5 feet tall. Stems and leaves are velvety green in color. Flowers are snow-white in color and bloom in the summer. They open in the evening and fade during the day.
Lily of the Valley (Convallaria majalis) Lily of the Valley
(Convallaria majalis)
Cultivated Naturalized in gardens, prefers partial shade. Ground cover, 6-8 inches high, forms colonies. Broad, glossy green elliptical leaves.
Lupine, blue bonnet (Lupinus argenteus) Lupine, blue bonnet
(Lupinus argenteus)
Native (also cultivated) Grows from lower elevations up to 10000 feet in elevation. Approximately 20 inches tall. Compound leaves, with 6-9 lance-shaped leaflets, with a silvery covering. All parts, especially ripe seeds, are potentially toxic.
Oleander (Nerium oleander) Oleander
(Nerium oleander)
Cultivated Evergreen shrub up to 20 feet tall. Leaves are leathery, dark green, long and narrow to 10 inches with pointed tip.
Oregon Grape (Mahonia Aquifolium) Oregon Grape
(Mahonia Aquifolium)
Native (also cultivated) A low growing plant with year-round pinnated, waxy green leaves that resemble holly. The plant bears dainty yellow flowers in early summer and a dark blue berry that ripens late in the Fall.
Pacific Yew (Taxus species) Pacific Yew
(Taxus species)
Cultivated The yews are evergreen shrubs or small trees with reddish-brown bark in thin flaking scales; leaves are dark green to yellow-green, shaped like a narrow sickle, stiff, 1.25 to 2.5 cm long, and pointed at the apex. Fruit is bright scarlet red or sometimes yellow and fleshy.
Peace Lily (Spathiphyllum species) Peace Lily
(Spathiphyllum species)
Houseplant Leaves come directly from the root and are large for plant, elliptical in shape and narrow to a point. Leaves are 1 -5 feet long and up to 6 inches wide. Flowers are spathe-shaped and either white or green. Berries may be found in clusters but are rarely seen.
Philodendron (Philodendron species) Philodendron
(Philodendron species)
Houseplant Fast growing plant with leathery, glossy leaves. Depending on species, may grow to 10-20 feet as a tree-like shrub.
Poinsettia (Euphorbia pulcherrima) Poinsettia
(Euphorbia pulcherrima)
Houseplant Leaves are oval and 4-7 inches long. They are lobed.
Poison Hemlock, Winter fern, California fern, spotted hemlock, poison parsley (Conium maculatum) Poison Hemlock, Winter fern, California fern, spotted hemlock, poison parsley
(Conium maculatum)
Native Grows along streamside and ditch banks at all elevations, tolerates poorly drained soils. Can be found throughout the United States. Grows 4-10 feet tall. Hollow, branched, spotted stems with purple splotches. Leaves are fern-like. Single white taproot that resembles a carrot. Poisonous parts: all parts.
Poison Ivy (Toxicodendron rydbergii) Poison Ivy
(Toxicodendron rydbergii)
Native Low shrub, rarely exceeds 4 feet in height. Prefers shady, wooded areas; found throughout the southwestern US.
Pothos, devil's ivy, taro vine, hunter's-robe (Epipremnum aureum) Pothos, devil's ivy, taro vine, hunter's-robe
(Epipremnum aureum)
Houseplant Commonly grown as an indoor potted plant and as an ornamental outdoors in warm climates. Heart-shaped or oval dark green leaves with yellow or white splotches, and slender stems. Grows as a vine.
Rubber Tree (Ficus species) Rubber Tree
(Ficus species)
Houseplant Narrow, leathery dark-green leaves that are 8-12 inches long.
Snow on the Mountain (Euphorbia marginata) Snow on the Mountain
(Euphorbia marginata)
Native, Cultivated Oval light green leaves, upper ones striped and marginated white. Contains milky white sap that is irritating to the skin and mouth.
Stinging Nettle (Urtica dioica) Stinging Nettle
(Urtica dioica)
Native Grows in moist, shaded woodland areas. Reaches about 4 feet tall at maturity, often grows in colonies. Leaves are lance-shaped and have sharp-toothed edges. Stems and leaves have hair-like structures.
Tulip (Tulipa species) Tulip
(Tulipa species)
Cultivated Common garden plant grown from bulbs.
Umbrella Tree (Schefflera actinophylla, Brassaia actinophylla) Umbrella Tree
(Schefflera actinophylla, Brassaia actinophylla)
Houseplant The plant has a long stalk with glossy bright green leaves. The leaves are divided into 7-16 leaflets. Houseplant does not generally bloom.
Virginia creeper, woodbine, American ivy, five-leaved ivy (Parthenocissus quiquefolia) Virginia creeper, woodbine, American ivy, five-leaved ivy
(Parthenocissus quiquefolia)
Cultivated Woody vine, leaves are elliptical and occur in groupings of 5 leaflets with saw-toothed edges. Foliage changes from green in summer to orange in Fall. Planted in gardens as a ground cover or on fences.
Wart weed,  spotted spurge (Euphorbia maculata) Wart weed, spotted spurge
(Euphorbia maculata)
Native Stems are branching, hairy, and often pink to red in color. Can grow up to 12 inches tall, but often forms mats. Grows from a taproot. Leaves are ovate shaped.
Water hemlock (Cicuta douglasii) Water hemlock
(Cicuta douglasii)
Native Grows along streamside, irrigation canals, and in moist pastures; seldom grows about 8500 feet in elevation. Grows 3 to 7 feet tall. Thick rootstocks have cross partitions at the base. Roots have separate chambers inside, and a musky odor. Leaves are lance-shaped, with toothed edges. Leaf veins run to the notches between the toothed edges. This plant is similar in appearance to Poison Hemlock, but there is little or no purple blotching on the stem. Poisonous parts: all parts, especially the roots and lower stems.
Western monkshood, wolfbane (Aconitum columbianum) Western monkshood, wolfbane
(Aconitum columbianum)
Native (also cultivated) Grows 2-4 feet tall in damp shady places in upper elevation mountain areas. Has fleshy roots and stout stems. Leaves are dark green and deeply divided with multiple segments; leaves become smaller towards the top of the plant. Poisonous parts: all parts, especially roots and leaves.