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List of plants poisonous to equines

This is a list of plants which are poisonous to equines. Some may cause mild reactions, such as diarrhea, others can lead to serious problems including horse colic, laminitis, and neurological problems, which, in some circumstances, can be fatal.

File:Echium plantagineum2.jpg
Paterson's Curse has been responsible for the deaths of many horses.
File:Starr 030405-0063 Ageratina adenophora.jpg
Crofton weed (Ageratina adenophora) (flowers and leaves).
File:Nerium oleander.jpg
The deadly Nerium oleander
  • Avocado (Persea americana)
  • Black locust (Robinia pseudoacacia)
  • Black walnut (Juglans nigra)
  • Blue periwinkle or large periwinkle (Vinca major) [1]
  • Bracken fern (Pteridium esculentum)[2] [1]
  • Buttercups (Ranunculus)[1]
  • Cape tulip (One or two leafed) (Homeria spp.)[3]
  • Cape weed (Arctotheca calendula)[1]
  • Castor oil plant (Ricinus communis) [2]
  • Catsear (Hypochaeris radicata) Especially draught horses.[1]
  • Chokecherry (Prunus virginiana)
  • Cocklebur (Xanthium strumarium)
  • Common heliotrope (Heliotropium europaeum)
  • Corkwood tree (Duboisia myoporoides)
  • Creeping heliotrope (Heliotropium supinum)[1]
  • Crofton weed (Ageratina adenophora) causes Tallebudgera Horse Disease.[5]
  • Dandelion (Taraxacum officinale) when infected with a toxic mold that grows on it, has been linked to outbreaks of Australian stringhalt.[6]
  • Darling peas (Swainsona)[1]
  • Deadly nightshade or belladonna (Atropa belladonna)
  • Field woundwort or stagger weed (Stachys arvensis)
  • Flatweed or catsear (Hypochaeris radicata), or perhaps a toxic mold that grows on it, has been implicated in causing 'Australian Stringhalt'.[7]
  • Foxglove (Digitalis)
  • Green Cestrum (Cestrum parqui)
  • Groundsel (Senecio cunninghamii)[1]
  • Guildford Grass (Onion Grass) (Romulea longifolia)[8]
  • Hemlock or Poison Hemlock (Conium maculatum)[1]
  • Horsetail (Equisetum)[2]
  • Johnson grass (Sorghum spp.)[9]
  • Leafy spurge (Euphorbia esula)
  • Locoweed (Astragalus spp. or Oxytropis spp.) Also known as: Crazy weed[2]
  • Lupin
  • Mallow (Malva parviflora)[1]
  • Mother of millions (Kalanchoe delagoensis)
  • Mountain-laurel or Spoonwood (Kalmia latifolia)
  • Nardoo(Marsilea drummondi) contains an enzyme which destroys vitamin B1, leading to brain damage in sheep and horses. [1]
  • Oak (Quercus)
  • Oleander (Nerium oleander)[2]
  • Onion weed (Romulea rosea)[1]
  • Paddy melon (Cucumis myriocarpus)[1]
  • Paspalum ergot (Claviceps paspali)[1]
  • Paterson’s Curse (Echium plantagineum)[11][1]
  • Perennial Rye-grass (Lolium perenne)[1]
  • Pheasant's eye (Adonis microcarpa]])[1]
  • Pokeweed (Phytolacca)
  • Privet (Ligustrum)
  • Quince (Cydonia oblonga)
  • Ragwort (Senecio)
  • Rattlepods (Crotalaria species)[4]
  • Red Maple, also known as Swamp or Soft Maple (Acer rubrum)
  • Rhododendron (including Azalea)[2]
  • Round billy button or woollyhead (Craspedia chrysantha]])[1]
  • Sagebrush (Artemisia tridentata)
  • St John's wort (Hypericum perforatum)
  • Sneezewort (Achillea ptarmica)
  • Solanaceae (including Deadly nightshade and Potato)
  • Stinging tree or Gympie stinger (Dendrocnide moroides)
  • Sudan grass (Sorghum species)[2][1]
  • Thorn-apple (Datura stramonium)[1]
  • Tobacco plants (Nicotiana)
  • Variegated thistle (Silybum marianum) Poisons cattle, sheep and rarely horses.[1]
  • Water hemlock (Cicuta virosa)
  • White Snakeroot (Ageratina altissima)
  • Yellow star thistle or St Barnaby's thistle (Centaurea solstitialis)[1]
  • Yew (Taxus sp)[2]


  1. 1.00 1.01 1.02 1.03 1.04 1.05 1.06 1.07 1.08 1.09 1.10 1.11 1.12 1.13 1.14 1.15 1.16 1.17 1.18 1.19 1.20 1.21 McBarron, E.J., Poisonous Plants, Inkata Press, Melbourne, 1983, ISBN: 0 0909605 29 7
  2. 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 "Poisonous Plants" Retrieved on 27 February 2009
  3. Common pasture weeds that may poison horses Retrieved on 6 March 2009
  4. 4.0 4.1 Australian Native Poisonous Plants Retrieved on 6 March 2009
  5. Crofton weed Retrieved on 7 April 2009
  6. Australian stringhalt Retrieved on 5 March 2009
  7. Australian stringhalt Retrieved on 5 March 2009
  8. Common pasture weeds that may poison horses Retrieved on 6 March 2009
  9. 10 Most Poisonous Plants for Horses Retrieved on 6 March 2009
  10. Production Animal Clinical Toxicology Retrieved on 1 April 2009
  11. Soar, Natasha, "Community and Regional Equine Sustainability", 2008

External links


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