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Plants Toxic to Horses
These plants are toxic to horses. Stable and farm owners should be aware.
420 plants
Absinth wormwood
Artemisia absinthium L.
Aconite-leaf buttercup
Ranunculus aconitifolius L.
Alder buckthorn
Frangula alnus Mill.; Rhamnus frangula L.
Alfalfa
Medicago sativa L.
Aloe
Aloe vera
Alpine delphinium
Delphinium elatum L.
Angel's Trumpet
Brugmansia suaveolens Humb. & Bonpl. ex Willd.
Angel's Trumpet
Brugmansia versicolor Lagerh.
Angular Solomon's seal
Polygonatum odoratum (Mill.) Druce, Polygonatum officinale All.
Apple of Peru
Nicandra physalodes (L.) Gaertn.
Apricot
Prunus armeniaca
Arabica Coffee
Coffea arabica L.
Avocado
Persea americana
Bay Laurel
Laurus nobilis
Belladonna
Atropa bella-donna L.
Belladonna Lily
Amaryllis belladonna L.
Bergamot Orange
Citrus Aurantium
Bird's Tongue Flower
Strelitzia reginae
Bitter aloe
Aloe ferox Mill.
Black Cherry
Prunus serotina
Black Elderberry
Sambucus nigra L.
Black Henbane
Hyoscyamus niger L.
Black Nightshade
Solanum nigrum
Black Walnut
Juglans nigra
Black locust
Robinia pseudoacacia L.
Bog rosemary
Andromeda polifolia L.
Box elder
Acer negundo L.
Brake Fern
Pteridium aquilinum
Broad bean
Vicia faba L.; Faba vulgaris Moench
Buckwheat
Fagopyrum esculentum Moench; Polygonum fagopyrum L.
Butterfly Iris
Iris spuria
Caladium
Caladium bicolor (Aiton) Vent.
Caper spurge
Euphorbia lathyris L.
Caraway
Carum carvi
Cardboard Cycad
Zamia furfuracea
Catawba rhododendron
Rhododendron catawbiense Michx.
Catsear
Hypochaeris radicata
Cherry laurel
Prunus laurocerasus L.
Chinese Evergreen
Aglaonema modestum
Chinese Wisteria
Wisteria sinensis (Sims) DC.; Glycine sinensis Sims
Chinese arborvitae
Thuja orientalis L.; Platycladus orientalis (L.) Franco
Chives
Allium schoenoprasum
Choke Cherry
Prunus virginiana
Cineraria
Pericallis x hybrida (Scheidw.) B.Nord.
Clusia Rosea
Clusia major
Common Bluebell
Hyacinthoides non-scripta (L.) Chouard ex Rothm.
Common Privet
Ligustrum vulgare
Common beech
Fagus sylvatica L.
Common box
Buxus sempervirens L.
Common groundsel
Senecio vulgaris L.
Common milkweed
Asclepias syriaca L.; Asclepias cornuti Decne.
Common sorrel
Rumex acetosa L.
Coontie Palm
Zamia pumila
Crown-of-thorns
Euphorbia milii Des Moul. ex Boiss.; Euphorbia bojeri Hook.; Euphorbia splendens Bojer ex Hook.
Cypress spurge
Euphorbia cyparissias L.
Daffodil
Narcissus pseudonarcissus L.
Dog's mercury
Mercurialis perennis L.
Downy Oak
Quercus pubescens Willd. (syn. Quercus lanuginosa Thuill.)
Drooping laurel
Leucothoe fontanesiana (Steud.) Sleumer
Dumb cane
Dieffenbachia seguine (Jacq.) Schott
Eastern Arborvitae
Thuja occidentalis L.
English Oak
Quercus robur L. (syn. Quercus pedunculata Ehrh.)
English Yew
Taxus baccata
European Bittersweet
Solanum dulcamara
European Holly
Ilex aquifolium
European heliotrope
Heliotropium europaeum L.
European spindle
Euonymus europaeus L.
Fern Palm
Zamia spp.
Field Pennycress
Thlaspi arvense
Field Poppy
Papaver rhoeas L.
Field bindweed
Convolvulus arvensis L.
Flaming Katy
Kalanchoe blossfeldiana Poelln.; Kalanchoe globulifera H. Perrier var. coccinea H. Perrier
Flax (Linseed)
Linum usitatissimum L.
Forking larkspur
Consolida regalis Gray (syn. Delphinium consolida L.)
Foxglove
Digitalis purpurea
Foxtail
Acalypha hispida
Garden Croton
Codiaeum variegatum (L.) A.Juss.; Croton variegatus L.
Garden heliotrope
Heliotropium arborescens L. (syn. Heliotropium peruvianum L.)
Garden tulip
Tulipa gesneriana L.
Gardenia
Gardenia jasminoides
Garlic
Allium sativum
Golden chain
Laburnum anagyroides Medik. (syn. Cytisus laburnum L.)
Golden dewdrop
Duranta erecta L. (synonyms: Duranta repens L., Duranta plumieri Jacq.)
Grass pea
Lathyrus sativus L.
Greater celandine
Chelidonium majus L.
Green hellebore
Helleborus viridis L.
Ground ivy
Glechoma hederacea L.s.l.
Heartleaf Philodendron
Philodendron hederaceum
Heartleaf philodendron
Philodendron scandens K.Koch & Sello; Philodendron hederaceum (Jacq.) Schott; Philodendron micans K.Koch; Philodendron oxycardium Schott
Hercules' Club
Aralia spinosa
Hoary Alyssum
Berteroa incana
Holm Oak
Quercus ilex L. (syn. Quercus sempervirens Mill.)
Horse Chestnut
Aesculus glabra
Horse Chestnut
Aesculus hippocastanum L.; Synonyms: Hippocastanum aesculus Cav., Hippocastanum vulgare Gaertn.
Horseradish
Armoracia rusticana P.Gaertn. & al.; Armoracia lapathifolia Gilib.
Hound's Tongue
Cynoglossum amabile
Houndstongue
Cynoglossum officinale L.
Hyacinth
Hyacinthus orientalis
Indian Azalea
Rhododendron simsii Planch.
Indian Hemp
Apocynum androsaemifolium
Iron Cross Begonia
Begonia masoniana
Italian arum
Arum italicum Mill.
Jack-in-the-pulpit
Arisaema triphyllum
Japanese maple
Acer palmatum Thunb.
Japanese spindle
Euonymus japonicus Thunb.
Japanese wisteria
Wisteria floribunda (Willd.) DC.
Jimson Weed
Datura stramonium L.
Kaffir Lily
Clivia miniata (Lindl.) Regel
Kidney Bean
Phaseolus vulgaris L.
Lacy tree philodendron
Philodendron bipinnatifidum Schott ex Endl. (syn. Philodendron selloum K. Koch)
Lantana
Lantana camara
Laurustinus
Viburnum tinus L.
Leek
Allium ampeloprasum
Lemon Grass
Cymbopogon citratus
Lenten Rose
Helleborus niger
Lily of the Valley
Convallaria majalis
Lobelia
Lobelia cardinalis
Lovage
Levisticum officinale
Mackay's horsetail
Equisetum x trachyodon A.Braun
Malaysian Dracaena
Dracaena reflexa
Marijuana
Cannabis sativa
Meadow Saffron
Colchicum autumnale
Mezereon
Daphne mezereum L.
Milk thistle
Silybum marianum (L.) Gaertn.; Carduus marianus L.; Silybum maculatum (Scop.) Moench
Mistletoe
Viscum album L.s.l.
Mole Bean Plant
Ricinus communis
Monkshood
Aconitum napellus aggr.
Mugwort
Artemisia vulgaris L.
Mum
Chrysanthemum spp.
Narrow-leaved ragwort / South African ragwort
Senecio inaequidens DC.
Nephthytis
Syngonium podophyllum
Nordmann fir
Abies nordmanniana (Steven) Spach
Northern Red Oak
Quercus rubra L., Quercus borealis Michx.
Old man's beard
Clematis vitalba L.
Oleander
Nerium oleander
Onion
Allium cepa
Orange
Citrus sinensis
Oregano (Greek Oregano)
Origanum vulgare hirtum
Paintbrush
Haemanthus albiflos Jacq., Haemanthus albomaculatus Baker
Parsley
Petroselinum crispum
Peace Lily
Spathiphyllum floribundum (Linden & Andre) N.E.Br.
Peach
Prunus persica
Peacock Flower
Caesalpinia pulcherrima
Pencil Cactus
Euphorbia tirucalli
Pennyroyal
Mentha pulegium L.
Persian cyclamen
Cyclamen persicum Mill.
Petty spurge
Euphorbia peplus L.
Pig's ears
Cotyledon orbiculata L.
Pin Oak
Quercus palustris Münchh.
Pink Pearl Begonia
Begonia semperflorens cultivar
Plantain Lily
Hosta plantaginea
Plum
Prunus domestica
Poinsettia
Euphorbia pulcherrima
Portugal laurel
Prunus lusitanica L.
Potato
Solanum tuberosum L.
Primrose
Primula vulgaris
Red bryony
Bryonia dioica Jacq.; Bryonia cretica L. subsp. dioica (Jacq.) Tutin
Red elderberry
Sambucus racemosa L.
Red pea
Lathyrus cicera L.
Rex Begonia
Begonia rex
Robusta coffee
Coffea canephora Pierre ex A.Froehner (syn. Coffea robusta L.Linden)
Rock Moss
Portulaca oleracea
Rosebay
Rhododendron spp
Rough horsetail
Equisetum hyemale L.
Sabi Star
Adenium obesum
Sacred Bamboo
Nandina domestica
Sago Palm
Cycas revoluta, Zamia species
Sander's alocasia
Alocasia sanderiana W.Bull
Satin Pothos
Scindapsus pictus
Scouring Rush
Equisetum arvense
Sea Squill
Drimia maritima (L.) Stearn (synonyms: Scilla maritima L., Urginea maritima (L.) Baker)
Seven Bark
Hydrangea arborescens
Sheepkill
Kalmia latifolia
Silver fir
Abies alba Mill.; Abies pectinata (Lam.) DC.
Silver maple
Acer saccharinum L.
Silver ragwort
Jacobaea maritima (L.) Pelser & Meijden
Small-flowered mallow
Malva parviflora L.
Snow-on-the-mountain spurge
Euphorbia marginata Pursh
Solomon's seal
Polygonatum multiflorum (L.) All.
Sorrel
Rumex scutatus
Soybean
Glycine max (L.) Merr.; Glycine soja (L.) Merr.
Spanish bluebell
Hyacinthoides hispanica (Mill.) Rothm.
Sprengeri Fern
Asparagus densiflorus cv sprengeri
St. John’s Wort
Hypericum perforatum
Stinking hellebore
Helleborus foetidus L.
Sun spurge
Euphorbia helioscopia L.
Superb Lily
Gloriosa superba
Swamp Maple
Acer rubrum
Sweet Cherry
Prunus avium
Sweet Pea
Lathyrus latifolius
Sweet Pea
Lathyrus odoratus L.
Sweetheart Ivy
Hedera helix
Sycamore maple
Acer pseudoplatanus L.
Tarragon
Artemisia dracunculus
Texas Umbrella Tree
Melia azedarach
Tobacco
Nicotiana tabacum L.
Tree Tobacco
Nicotiana glauca
Tropical milkweed
Asclepias curassavica L. (syn. Asclepias nivea L. var. curassavica (L.) Kuntze)
Tuberous pea
Lathyrus tuberosus L.
Turban Squash
Cucurbita maxima cv turbaniformis
Umbrella Leaf
Podophyllum peltatum
Velvet Maple
Acer velutinum Boiss.
Viper's Bugloss
Echium plantagineum
Wahoo
Euonymus occidentalis
Warneckei Dracaena
Dracaena deremensis
Water fennel
Oenanthe aquatica (L.) Poir.
Water horsetail
Equisetum fluviatile L.; Equisetum limosum L.
Water-hemlock
Cicuta virosa L.
Watercress
Nasturtium officinale
Wax-Leaf
Ligustrum japonicum
Weeping Fig
Ficus sp.
Western Yew
Taxus brevifolia
White Snakeroot
Ageratina altissima
White Sweet Clover
Melilotus albus Medik.
White bryony
Bryonia alba L.
White hellebore
Veratrum album L.s.l.
White lupine
Lupinus albus L. (syn. Lupinus sativus Gaertn.)
White swallow-wort
Vincetoxicum hirundinaria Medik.
Wild Coffee
Polyscias guilfoylei
Wild Radish
Raphanus raphanistrum
Wild cabbage, Kale
Brassica oleracea L.
Winged broom
Genista sagittalis L.
Winter Cherry
Solanum pseudocapsicum
Winterberry
Ilex opaca
Wood anemone
Anemone nemorosa L.
Yarrow
Achillea millefolium
Yellow Pine
Pinus ponderosa
Yellow lupin
Lupinus luteus L.
Yellowrocket
Barbarea vulgaris
Yesterday-today-and-tomorrow
Brunfelsia pauciflora (Cham. & Schltdl.) Benth.; Brunfelsia calycina Benth.
Yucca
Yucca spp.
Alexandrian senna
Cassia senna L., Cassia acutifolia Delile, Senna alexandrina Mill.
Alocasia
Alocasia spp.
Alpine Ragwort
Senecio alpinus (L.) Scop.
Alsike Clover
Trifolium hybridum
Amaryllis
Hippeastrum vittatum (L'Her.) Herb.
Ambrosia Mexicana
Chenopodium botrys
American Bittersweet
Celastrus scandens
American Mistletoe
Phoradendron flavescens
American Yew
Taxus canadensus
Apple
Malus sylvestrus
Begonia
Begonia spp.
Big-flowered Foxglove
Digitalis grandiflora Mill.
Birdsville indigo
Indigofera linnaei Ali
Bog Laurel
Kalmia poliifolia
Borage
Borage officinalis
Boxwood
Buxus spp.
Branched horsetail
Equisetum ramosissimum Desf.
Brunfelsia
Brunfelsia latiflora (Pohl) Benth.
Buckeye
Aesculus spp
Buckwheat
Fagopyrum spp.
Bulbous buttercup
Ranunculus bulbosus L.
Buttercup
Ranunculus spp.
Calamondin Orange
Citrus mitis
Cape-tulip
Haemanthus coccineus L.
Cascara Sagrada
Frangula purshiana (DC.) J.G.Cooper; Rhamnus purshiana DC.
Charlock
Brassica kaber
Cherry
Prunus spp.
Chinese Aconite
Aconitum carmichaelii Debeaux
Clematis
Clematis spp.
Clematis
Clematis-Hybride
Common Bamboo
Bambusa vulgaris Schrad. ex J.C.Wendl.; Bambusa vulgaris Schrad. ex J.C.Wendl. var. vittata Riviere
Common Marsh Marigold
Caltha palustris L.
Copperleaf
Acalypha godseffiana
Cordatum
Philodendron oxycardium
Corn buttercup
Ranunculus arvensis L.
Corncockle
Agrostemma githago L.
Cowbane
Cicuta species
Creeping buttercup
Ranunculus repens L.
Creeping indigo
Indigofera spicata Forssk.
Crown Vetch
Securigera varia (L.) Lassen (syn. Coronilla varia L.)
Cursed buttercup
Ranunculus sceleratus L.
Cycads
Cycas and Zamia species
Dahlia
Dahlia species
Death Cap
Amanita phalloides (Vaill. ex Fr.) Link
Destroying angel
Amanita virosa (Fr.) Bertillon
Dock
Rumex sp.
Dog Hobble
Leucothoe sp.
Dogbane Hemp
Apocynum spp.
Doubtful knight's spur
Consolida ajacis (L.) Schur; Delphinium ajacis L.
Dwarf chenille plant
Acalypha chamaedrifolia (Lam.) Mull. Arg.; Acalypha reptans Sw.
Eastern Star
Dianthus spp.
Elephant-Ear Begonia
Begonia scharfii
Epazote
Chenopodium ambrosioides
Eucalyptus
Eucalyptus species
European buckthorn
Rhamnus catharticus L.
False morel
Gyromitra esculenta (Pers. ex Pers.) Fr.
Fen ragwort
Senecio paludosus L.
Fetter Bush
Leucothoe spp.
Fetterbush
Lyonia spp.
Fiddleneck
Amsinckia spp.
Figwort
Ranunculus acris
Flat pea
Lathyrus sylvestris L.
Fly Honeysuckle
Lonicera xylosteum L.
Fly agaric
Amanita muscaria (L.) Lam.
Fool's parsley
Aethusa cynapium L.
Funeral Bell
Galerina marginata (Batsch) Kühner
Geranium
Pelargonium species
Giant Hogweed
Heracleum maximum
Gladiola
Gladiolus species
Goat's rue
Galega officinalis L.
Golden clematis
Clematis tangutica (Maxim.) Korsh.
Golden oat grass
Trisetum flavescens (L.) P.Beauv.
Grapefruit
Citrus paradisii
Great horsetail
Equisetum telmateia Ehrh., Equisetum maximum auct.
Great spearwort
Ranunculus lingua L.
Greater Ammi
Ammi majus
Hairy buttercup
Ranunculus sardous Crantz, Ranunculus philonotis Retz
Hairy indigo
Indigofera hirsuta L.
Heliotrope
Heliotropium spp.
Henbane Bell
Scopolia carniolica Jacq. (syn. Hyoscyamus scopolia)
Herb Paris
Paris quadrifolia L.
Hoary ragwort
Senecio erucifolius L.; Jacobaea erucifolia (L.) P.Gaertn., B.Mey. & Scherb.
Hosta
Hosta plataginea
Imperforate St. John's-wort
Hypericum maculatum Crantz s.l.
Indian Mustard (White/Black/Yellow Variants)
Brassica species
Indigofera lespedezioides
Indigofera lespedezioides Kunth, Indigofera pascuorum Benth.
Jade Plant
Crassula argentea
Japanese Yew
Taxus sp.
Japanese star anise
Illicium anisatum L.
Jonquil
Narcissus jonquilla
Kaffir Lily
Clivia minata
Lady of the night
Brunfelsia uniflora (Pohl) D.Don
Lambkill
Kalmia augustifolia
Larkspur
Delphinium species
Lavender
Lavendula angustifolia
Lemon
Citrus limonia
Lemon Verbena
Aloysia triphylla
Lesser celandine
Ranunculus ficaria L.; Ficaria verna Huds.
Lesser spearwort
Ranunculus flammula L.
Lime
Citrus aurantifolia
Loco Weed
Astragalus spp.
Loco Weed
Oxytropis spp.
Locust
Robinia spp.
Mapleleaf Begonia
Begonia cleopatra
Marsh horsetail
Equisetum palustre L.
Marsh ragwort
Senecio aquaticus Hill
Marsh spurge
Euphorbia palustris L.
Meadow horsetail
Equisetum pratense Ehrh.
Metallic Leaf Begonia
Begonia metallica
Milkweed
Asclepias species
Mint
Mentha sp.
Morning Glory
Ipomoea spp
Mountain Fetter-bush
Pieris floribunda (Pursh) Benth. & Hook.f.
Mountain death camas
Anticlea elegans (Pursh) Rydb.
Naked Lady
Amaryllis spp.
Nightshade
Solanum spp
Northern wolfsbane
Aconitum lycoctonum L.s.l./L.s.str., Aconitum vulparia aggr./Rchb.s.str., Aconitum lycoctonum subsp. neapolitanum (Ten.) Nyman, Aconitum lycoctonum subsp. vulparia (Rchb.) Nyman, Aconitum altissimum Mill./Mill.p.p., Aconitum lamarckii Rchb., Aconitum ranunculifolium Rchb., Aconitum pyrenaicum L., Aconitum x platanifolium Degen & Gáyer, Aconitum penninum (Ser.) Gáyer
Oak
Quercus species
Pale Laurel
Kalmia polifolia
Panther Cap
Amanita pantherina var. pantherina (DC. ex Fr.) Krombh.
Paper White
Narcissus spp
Peony
Paeonis officinalis
Pheasant's eye
Adonis vernalis L.
Philodendron Pertusum
Philodendron spp
Poinciana
Caesalpinia gilliessi
Poison Hemlock
Conium maculatum
Ragwort
Senecio jacobaea L. (syn. Jacobaea vulgaris L.)
Ragwort
Senecio species
Rapeseed
Brassica napus L.
Rattlebox
Crotalaria albida
Rayless Goldenrod
Haplopappus heterophyllus
Red staining inocybe
Inocybe erubescens A.Blytt (syn. Inocybe patouillardii Bres.)
Rhubarb
Rheum rhabarbarium
Ridderstjerne
Hippeastrum spp.
Roman Chamomile
Anthemis nobilis
Rosary Pea
Abrus precatorius
Rough Chervil
Chaerophyllum temulum L.
Royal purple brunfelsia
Brunfelisa grandiflora D.Don
Russian Knapweed
Centaurea repens
Sessile oak
Quercus petraea (Matt.) Liebl.
Shamrock Plant
Oxalis spp.
Sheep laurel
Kalmia angustifolia L. (syn. Kalmia intermedia Lange)
Showy Daisy
Erigeron speciosus
Skunk Cabbage
Symplocarpus foetidus
Small yellow foxglove
Digitalis lutea L.
Sorrel webcap mushroom
Cortinarius orellanus Fries; Cortinarius rubellus Cooke
Spanish Thyme
Coleus ampoinicus
Spindle Tree
Euonymus atropurpurea
Spring Parsley
Cymopterus watsonii
Spring crocus
Crocus albiflorus Kit.; Crocus vernus (L.) Hill subsp. albiflorus (Kit.) Asch. & Gr.
St. Peter's Wort
Hypericum tetrapterum Fr. (syn. Hypericum acutum Moench)
Staggerbush
Lyonia sp.
Stavesacre
Delphinium staphisagria L.
Stinking Chamomile
Anthemis cotula
Sudan Grass
Sorghum vulgare var sudanesis
Summer pheasant's-eye
Adonis aestivalis L.
Tall yellow sweetclover
Melilotus altissimus Thuill.
Tar spot
Rhytisma acerinum (Pers.) Fr.
Tinnevelly senna
Senna alexandrina Mill. (syn. Cassia angustifolia Vahl)
Tomato Plant
Lycopersicon spp
Torn fibrecap
Inocybe rimosa (Bull.) P.Kumm.; Inocybe fastigiata (Schaeff.) Quél.
Tulip
Tulipa spp.
Turkey Oak
Quercus cerris L.
Variegated Laurel
Tradescantia flumeninsis
Variegated horsetail
Equisetum variegatum Schleich.
Variegated monk's hood
Aconitum variegatum L.s.l.
Vinca
Vinca rosea
Viper's Bugloss
Echium vulgare
Virgin's Bower
Clematis sp.
Wake Robin
Arum maculatum
Water Hemlock
Cicuta maculata
Waterfennel
Oenanthe fistulosa L.
Waterfennel, Water Dropwort
Oenanthe lachanalii C.C.Gmel.
White Heads
Sphenosciadium capitellatum
Wild Calla
Arum palestinum
Wintercress
Barbarea orthoceras
Wisteria
Wisteria spp.
Wood horsetail
Equisetum sylvaticum L.
Woolly foxglove
Digitalis lanata Ehrh.
Wormseed Mustard
Erysimum cheiranthoides
Yellow Monkshood
Aconitum anthora L.
Yellow Oleander
Thevetia peruviana
Yellow Starthistle
Centaurea solstitialis
Yellow Sweet Clover
Melilotus officinalis Lam., Melilotus arvensis Wallr.
Yellow azalea
Rhododendron luteum Sweet; synonyms: Rhododendron flavum G. Don, Azalea pontica L.
Yellow iris
Iris pseudacorus L.
Yesterday, Today, Tomorrow
Brunfelsia species
Yew
Taxus spp.
Yew Pine
Podocarpus macrophylla