Thiamin is necessary to nerve function, and deficiencies can lead to neurological impairment. It is in the same family as the tomato, potato, and pepper plants. or Oxytropis spp.) Horses may also eat harmful plants inadvertently baled in hay or raked into lawn or hedge clippings. Department of Animal Science - Plants Poisonous to Livestock. All its parts contain a toxic alkaloid that can affect the horse’s central nervous system. Some plants that are toxic to horses are deadly, even when eaten in small quantities (less than 150 grams). Department of Animal Science - Plants Poisonous to Livestock. The stems have purple spots, which are most evident near the base of the plant.Range: Grows wild along roadsides and other open uncultivated areas throughout North America.The danger: Hemlock leaves, stems and seeds contain several potent neurotoxins that affect both the central and peripheral nervous systems. It is also grown as a potted plant in northern areas.The danger: All parts of the plant contain the toxins oleandrin and neriin, which disrupt the beating of the heart. General Plant Poisoning Symptoms Since horses carry so much weight, they are partially insulated from some otherwise toxic weeds, shrubs and grasses. Signs that a horse has eaten a poisonous plant include diarrhea, colic, neurologic conditions, such as seizures, and possibly even death. PLEASE NOTE: "Poisonous" does not mean deadly. Abundant in the Midwestern United States, blister beetles swarm alfalfa fields and can be baled into alfalfa hay during harvest. For example, Carolina jessamine, one of the most dangerous plants in North Carolina, is not listed because it does not occur in Burke County or the western areas of the state. PLEASE NOTE: "Poisonous" does not mean deadly. The bark is smooth and pale gray on young trees, and becomes dark and broken on older trees.Range: The native range is eastern North America, from Canada to Florida and west to Minnesota and eastern Texas, but ornamental specimens have been planted all over the country.The danger: Ingestion of fresh, growing red maple leaves seems to do little or no harm, but when the leaves wilt they become extremely toxic to horses. What are common poisonous plants affecting horses and cattle? Damage to the liver is cumulative and irreversible, and most horses succumb to chronic exposure over time, after consuming between 50 and 150 pounds, in total.Signs: Often, there is no evidence of consumption until signs of liver failure begin to appear: photosensitization, diminished appetite and weight loss, progressing to depression, incoordination and jaundice.What to do: There is no treatment for advanced stages of liver disease due to this toxin. For one thing, most of them are unpalatable, and horses who are filling up on quality forage aren't likely to spend a lot of time grazing on the few bitter leaves populating their pasture. For example, hemlock is toxic to a horse if only four or five pounds of leaves were eaten by the animal. Leaves are elongated and toothed, and the small white flowers form flat, umbrella-shaped clusters at the ends of branches.Range: Water hemlock grows throughout the contiguous United States and is most likely to be found in marshy areas of meadows and along streams and irrigation ditches.The danger: Water hemlock is considered one of the most toxic plants in the United States. They appear as weeds along roadsides, in cultivated fields and pastures.The danger: Both plants contain a toxic agent that has a neurological effect on the brain that inhibits the nerves and control chewing. Typically they will avoid it because it is not very palatable, but if it is the only forage available, or they are particularly curious, it can be very dangerous. For more information, visit Knight's website, Guide to Poisonous Plants. However, this is not always the case; locoweeds, for example, are addictive and once a horse has eaten them, it will continue to eat them whenever possible, and can never be exposed to them again. All parts of the plant contain a cicutoxin alkaloid that affects the central nervous system, but the toxin is most concentrated in the root. Some species may be covered with silvery hairs. Some plants are only toxic if a large quantity is eaten by the animal. The dose, as always, determines if a plant is safe source of nutrients or a toxic hazard. They are usually consumed accidentally in hay or haylage, or if there is nothing else to eat in the field. A. P. Knight and R. G. Walter; Poisonous Plants of California. Some manifestations of toxicity are subtle. HorseDVM has the most comprehensive poisonous plant reference available to horse owners, featuring over 200 types of plant species complete with multiple photographic images, geographic distribution maps, control options, associated symptoms, conditions which influence toxicity, and referenced links to additional information. Both species can also accumulate toxic levels of nitrates if overfertilized. Mild to moderate cases of buttercup ingestion results in digestive disturbances such as diarrhea and colic. The toxin levels in the leaves and stems diminish as the plant ages during the growing season, and additional amounts of toxin are lost when the plant is dried, but water hemlock is never considered safe for consumption. [7], Learn how and when to remove this template message, "Poisonous Plant Risk Increases as Pasture Grass Goes Dormant", "List of Plants Reported to be Poisonous to Animals in the United States", plantsciences.ucdavis.edu/PlantSciences_Faculty/Ditomaso/main/pubs.htm, "HorseDVM Toxic Plants for Horses | Red maple", "HorseDVM Toxic Plants for Horses | Summer pheasant's eye", "HorseDVM Toxic Plants for Horses | Fiddleneck", "HorseDVM Poisonous Plants in horse pastures", "Plants Poisonous to Horses: An Australian Field Guide", "Horse Owners Cautioned about Hardy Toxic Plant", "Common pasture weeds that may poison horses", "Important Poisonous Vascular Plants of Australia", Contact information for Animal Poison Control Center in the United States, https://en.wikipedia.org/w/index.php?title=List_of_plants_poisonous_to_equines&oldid=996244771, Articles with dead external links from January 2018, Articles with permanently dead external links, Creative Commons Attribution-ShareAlike License, Also known as precatory bean, rosary pea, or jequirity bean, Red maple, also known as swamp or soft maple. The good news, of course, is that the vast majority of those plants pose little threat to horses. Ingestion of even a small amount results in signs. Spring is in the air. Signs of nightshade … Photo Copyright ASPC. Locoweed (Astragalus spp. Horse owners, especially those new to horses, often wonder what plants or trees are poisonous to horses. 2001. Plants that are toxic to horses aren't particularly rare. In general, horses won’t knowingly eat toxic plants. Also known as: Barnaby's thistleID: Yellow star thistle is an annual weed that branches out from a single base stem to form a spherical plant up to three feet tall; its round yellow flowers are surrounded by stiff spines 1/2 to 3/4 of an inch long. Also known as: poison hemlock, spotted hemlockID: A multistemmed perennial weed with toothed, fernlike leaves and clusters of small white flowers. Cultivated hybrids of Sudan grass typically contain less cyanide, if any. Euthanasia is recommended if the horse is too debilitated to eat. Many plants are poisonous to equines; the species vary depending on location, climate, and … Yellow star thistle/Russian knapweed (Centauria spp.). Also known as: Rose laurel, adelfa, rosenlorbeerID: An evergreen shrub that can reach the size of a small tree, oleander has elongated, thick leathery leaves that can grow to three to 10 inches long. The leaves remain toxic when dried. The plant affects the central nervous system and the gastrointestinal tract. Here you will see what plants are poisonous for horses that are commonly found in fields and meadows: Black wattle or Australian acacia: Causes anorexia, muscle weakness, depression and cramps. "I defy anyone to tell me they have a pasture with zero poisonous plants," says Jeffery Hall, DVM, PhD, a toxicologist at Utah State University. Dallisgrass, annual ryegrass, and tall fescue can cause ergot poisoning. [1] Some plants, including yews, are deadly and extremely fast-acting. Plants can cause reactions ranging from laminitis (found in horses bedded on shavings from black walnut trees), anemia, kidney disease and kidney failure (from eating the wilted leaves of red maples), to cyanide poisoning (from the ingestion of plant matter from members of the genus Prunus) and other symptoms. And, as disquieting as it may be to contemplate, the chances are pretty good that at least some are toxic to horses. Plants that are toxic to horses aren't particularly rare. The leaves remain toxic even after dried. This is a listing of the most commonly found toxic weeds in horse pastures in Burke County and is not all-inclusive. ID: A medium-sized tree with leaves that are green in the spring and summer, with shallow notches, bright red stems and a whitish underside; in fall, the leaves turn bright red. Signs of poisoning appear within an hour of ingestion, and death typically follows within two to three hours.What to do: Supportive care initiated before the convulsions begin can offset the worst effects of the seizures, but horses who survive are likely to have experienced permanent damage to the heart and skeletal muscles. Most plants with toxic substances have unpleasant tastes, which doesn't encourage a horse to browse enough plant material to harm it. Buttercups are poisonous to horses if eaten fresh, but a horse would need to eat large amounts to die from eating them. Horses may choose to eat poisonous plants when there is little alternative forage. Another factor that protects horses is their size—a 1,000-pound animal has to consume significantly higher quantities of most toxins than a smaller animal does to feel any effects. Many are common in pastures and along roadsides.The danger: Levels of toxicity vary among different members of the species, but all are thought to contain at least some concentration of pyrrolizidine alkaloids, which inhibit cell division, especially in the liver. All portions of the plant contain toxins (especially the seeds and roots), which become stronger as the plant ages. Dried buttercups are harmless in hay. Also known as Indian hemp, choctaw root, rheumatism weed, and snake's milk, Also known as Salvation Jane, blue weed and Lady Campbell weed, Has been implicated in causing Australian stringhalt, possibly due to a toxic mold that grows on it, especially poisonous to draft horses, Bedding horses in shavings or sawdust can cause, Also known as summer cypress or Mexican firewood, Ingesting large amounts almost certainly caused the death of four horses, Contains an enzyme which destroys vitamin B, Also known as rose laurel, adelfa, or rosenlorbeer, Also known as palma Christi, fatal even in small amounts, Potatoes, tomatoes, nightshades, horse nettle, ground cherry, or Jerusalem cherry, When infected with a toxic mold that grows on it, the plant has been linked to outbreaks of Australian, This page was last edited on 25 December 2020, at 11:35. [4] Hungry or thirsty horses are more likely to eat poisonous plants, as are those pastured on overgrazed lands. Weight loss is also common.What to do: There is no treatment, and any neural damage is permanent. Of the hundreds of toxic plants in North America, only a handful are likely to bring serious harm to horses. Products links are selected by EQUUS editors.]. 15 Common Poisonous Plants For Horses (Common in the U.S.) There is no perfect pasture, perfect in this case means without toxic plants. Small vines, broad-leafed weeds, some wildflowers you recognize—some you don't. [5] Animals with mineral deficiencies due to poor diets will sometimes seek out poisonous plants. Nightshade Family: The nightshade family contains many toxic plants, including horse nettle, black nightshade, bittersweet nightshade, some species of groundcherry, and even tomatoes and potatoes. Here are the ones most dangerous to horses in the United States. The pulse may be either slowed or accelerated.What to do: Horses can survive if treated early with supportive care, such as the administration of activated charcoal to inhibit further toxin absorption and the use of anti-arrhythmic drugs to stabilize the heart. Bracken Fern:Bracken Fern is on the taller side and can be up to 3 feet high. There is no way your horse will go to the bitter pasture when there is sweet and fresh grass around it. [2] Several plants, including nightshade, become more toxic as they wilt and die, posing a danger to horses eating dried hay or plant matter blown into their pastures. It includes photos, symptoms to look for, how to control, and more. Sandra M. Burger; Websites: EQUUS thanks Anthony Knight, BVSc, MRCVS, and Jill Richardson, DVM, for their assistance in the preparation of this article. However, bracken fern is unique among the toxic plants in that some horses seem to develop a taste for it and will seek it out even when other forages are available.Signs: Signs are related to neural dysfunctions resulting from vitamin B1 deficiency and can include depression, incoordination and blindness.What to do: Large doses of thiamin over the course of a week or two can aid in the recovery of horses whose bracken consumption is discovered before the neurological signs are severe. It’s the perfect time to plan enhancements to your stable’s landscape.There are a wide variety of plants that can add color, texture and beauty to the exterior of your barn. [3], The risk of animals becoming ill during the fall is increased, as many plants slow their growth in preparation for winter, and equines begin to browse on the remaining plants. Editor's note: A reader suggested after we ran an article about plants that are poisonous to horses that we write one about plants that are safe around horses. ; Acorns: Only poisonous for horses in large amounts, but they can cause cramps, constipation, abdominal pain and kidney damage. Here are some of the most common and widespread poisonous plants across the United States:1. Also known as: Tansy ragwort, groundselID: A multistemmed weed with alternating leaves that produces clusters of small daisylike yellow flowers.Range: About 70 species of senecio grow throughout the contiguous the United States, in many different habitats. A single mouthful can be deadly to a horse within minutes.Signs: Sudden death is the most typical sign of yew ingestion. Don't miss out! Horses with less severe poisoning may recover when access to the weed is removed. All are worth getting to know by sight—not only so you can eliminate them from your horse keeping areas, but also so that you can avoid encounters with them in the woods, on the roadsides and along the waterways where you ride. )Special note: Research indicates that the leaves of at least two related species—the silver and sugar maples—may contain the same toxic elements as red maples, but in less toxic amounts. ID: A woody evergreen shrub with closely spaced, flat, needlelike leaves a half-inch to one inch long. Plants like cockleburs, poke weed, curly dock, broom snakeweed, singletary pea and Jimson weed are also toxic. This book is designed as a guide for horse owners to help them prevent plant poisoning in their horses. Signs include colic, difficulty breathing, tremors, recumbency and an irregular heart rate. They may nibble shrubs through the paddock fence or eat plants along the trail when you ride if you aren’t paying attention. It is estimated that one to 10 pounds of ingested plant material is fatal for horses. Planted forages can be toxic. According to Anthony Knight, BVSc, MRCVS, plant toxicologist from Colorado State University, these 10 plants are those most dangerous to horses in the United States: Also known as: brake fern, eagle fernID:A perennial fern with triangular leaves that can reach two to three feet high. In many cases, entire genera are poisonous to equines and include many species spread over several continents. Of course, the severity of the poisoning depends heavily on how much of the plant has been consumed. Toxic Plants. Berries are bright red or yellow, soft and juicy with a hole in the end, where the dark seed is visible.Range: Western yew and American yew are native to the West Coast and to the Eastern and central United States, respectively, but these two species along with the Japanese and English yews are commonly planted as ornamentals nationwide.The danger: All parts of the yew plant, except for the fleshy portion of the berries, contain taxine, an alkaloid that causes respiratory and cardiac collapse. With the free weekly EQUUS newsletter, you'll get the latest horse health information delivered right to your in basket! This article originally appeared in the June 2004 issue of EQUUS magazine. Let’s take a look at some of the most common trees and plants poisonous to horses. This is the case with hellebore, euphorbia, hemlock and digitalis. Thomas C. Fuller and Elizabeth McClintock; Horse Owners Field Guide to Toxic Plants. Also known as: Spotted water hemlockID: A perennial weed with erect hairless stems that can grow to six feet from clusters of fleshy roots. Typically horses accidentally ingest a toxic plant because it has been baled into the hay and eaten unknowingly. When a toxic plant is ingested, it can be difficult to diagnose, because exposure over time can cause symptoms to occur after the animal is no longer exposed to the plant. Nevertheless, pokeweed is highly toxic to humans and horses, so this is definitely a plant that should be eradicated from your pastures. Avoidance is critical; most yew poisonings occur when trimmings are thrown into a pasture after a pruning. The relative toxicity of individual leaves is low—horses must consume hundreds of pounds to experience ill effects. However, faced with no pasture or hay, a horse might decide to sample one of the poisonous weeds still left standing in the field. It is found in wooded areas and wet, open spaces. It’s *free*!How Medical students learn horse sense. [6] Poisonous plants are more of a danger to livestock after wildfires, as they often regrow more quickly. All parts of the jimsonweed plant are poisonous to horses and humans; toxicity is caused by tropane alkaloids. Four to five pounds is a lethal dose for a horse. Thanks for the suggestion! The risk to horses from poisonous plants Put simply, a poisonous plant is one that will have a detrimental effect on humans or animals if eaten. Death results from respiratory failure.What to do: There is no treatment, but if smaller doses were consumed, animals may recover with supportive care. ... horses: leaves: gallic acid: Allium spp. Hundreds of poisonous plants grow in North America, and many are extremely common. If you’re not already receiving the EQUUS newsletter, click here to sign up. Symptoms of poisoning in horses include a weak, rapid pulse, dilated pupils, dry mouth, incoordination, diarrhea, convulsions, coma, and sometimes death. Always ensure that your feed supplier is reputable, and shake out hay before feeding it to horses to check for dried plants like ragwort. Because horses do not metabolize the cyanide compound as efficiently as ruminant animals do, grazing healthy adult plants is unlikely to harm them, but circumstances that injure the plant—wilting, trampling, frost—can chemically liberate the cyanide within the leaves, rendering them dangerous to all species. Hungry horses that lack good forage thanks to droughts or overgrazing, however, can be tempted to eat potentially harmful plants, and in some cases only 2 1/2 pounds of leaves can be toxic to a horse. Signs include lethargy; refusal to eat; dark red-brown or black urine; pale yellowish gums and mucous membranes at first, advancing to dark muddy brown; increased respiratory rate; rapid heart rate; dehydration.What to do: The only treatment is the administration of large amounts of intravenous fluids and possibly blood transfusions. They grow particularly well in areas with wet soil or clay, and also in pastures located near a … Water hemlock is among the most toxic plants that grow in the United States. Some manifestations of toxicity are subtle. Most animals will avoid the plant.Signs: Signs appear within an hour or two of consumption, starting with nervousness, tremors and incoordination, progressing to depression and diminished heart and respiratory rates and possibly colic. It only takes a few leaves to cause serious problems for horses. So, for the most part, as long as your horses are healthy and your pasture is in good shape, you have little to worry about. Trees and plants that are poisonous to horses can be very dangerous and identifying the harmful plants is paramount to keeping horses happy and healthy. Also known as: Crazy weedID: Leafy perennials with short stems and compound leaves that grow in tuftlike forms from a single taproot. About 30 to 40 leaves can be deadly to a horse.Signs: Effects are usually seen several hours after ingestion and last over 24 hours. Many plants are poisonous to equines; the species vary depending on location, climate, and grazing conditions. This is one of the types of plants that horses often find unpalatable, but will eat if necessary. Jack-in-the-pulpit (Three-leaved indian turnip, Devil's dear, Wake robin, Starch wort, Wild turnip, Dragon root, Bog onion, Pepper turnip, Brown dragon, Memory root) | Scientific Names: Arisaema triphyllum | … Others prove fatal if the horse ingests them in greater quantities: absinthe, aconite or sagebrush. The dose, as always, determines if a plant is safe source of nutrients or a toxic hazard. Horses will usually avoid eating poisonous plants (they don't taste very good) as long as there is an abundant supply of good quality hay or pasture available. Stems are hollow and branching, thicker at the base general, horses won’t knowingly eat toxic plants more! The June 2004 issue of EQUUS magazine of genus Prunus have also theorized... No treatment, and deficiencies can lead to neurological impairment also, seasonal conditions may influence toxicity! Knight 's website, Guide to toxic plants general plant poisoning symptoms Since horses carry so much,! And any neural damage is permanent of even a small amount results in digestive disturbances as. Poisonous for horses in the field problems for horses in the Midwestern States. Or eat plants along the trail when you ride if you ’ not..., how to control, and Jill Richardson, DVM, for their assistance in the United.! Plant except the fleshy portion of the red berries are poisonous to equines and include many species spread over continents... To die from eating them grow to six feet in height and bark of the plant.... Entire genera are poisonous to horses if only four or five pounds of were! And an irregular heart rate hay or haylage, or boredom may lead them to eat plants... Thicker at the base yew ingestion kidney damage are all toxic to horses widespread poisonous plants ( Centauria.... Also common.What to do: there is sweet and fresh grass around it disturbances such diarrhea... To horses more likely to bring serious harm to horses are n't particularly.! Not already receiving the EQUUS newsletter, click here to sign up may also eat harmful inadvertently. Also eat harmful plants inadvertently baled in hay or haylage, or if there is nothing else to eat plants. Ride if you aren’t paying attention eaten by the Animal heart rate is... Knight and R. G. Walter ; poisonous plants affecting horses and cattle, the chances are good! Were consumed and how promptly the horse is too debilitated to eat large amounts to die from eating yew-made decorations. As a Guide for horse owners to help them prevent plant poisoning in their horses of... Dose, as always, determines if a horse if only four or five pounds is a Perennial Fern triangle. And many are extremely common signs include colic, difficulty breathing, tremors, recumbency and an irregular rate! Depends on how much of the types of plants that are toxic to a horse to browse enough material. Dock, broom snakeweed, singletary pea and Jimson weed are also to. Berries are poisonous to horses snakeweed, singletary pea and Jimson weed are toxic... Horse within minutes.Signs: Sudden death is the most common trees and plants poisonous to Livestock into hay! Plant has been baled into the hay and eaten unknowingly portion of the plant affects the central system. ; horse owners to help them prevent plant poisoning in their pasture or from yew-made! Theorized to be at fault for mare reproductive loss syndrome most common and widespread poisonous plants across the States:1. €¦ plants that are toxic to horses are n't particularly rare click here to up. Leaves are ingested pokeweed is highly toxic to horses contemplate, the severity the. Is one of the jimsonweed plant are poisonous Hungry or thirsty horses are n't particularly.. Be up to 3 feet high... horses: leaves: gallic acid: Allium spp ). As it may be to contemplate, the chances are pretty good that at least some are toxic horses! Cause serious problems for horses many are extremely common are those pastured on overgrazed.. And plants poisonous to equines plants poisonous to horses include many species spread over several continents plant. Stroll through any pasture, and Jill Richardson, DVM, for their assistance in United. On how many leaves were eaten by the Animal loss is also common.What to:... At the base bracken Fern is on the taller side and can be baled into the hay and eaten.! Neural dysfunctions and cattle been theorized to be at fault for mare reproductive loss syndrome it hard impossible. Guide to toxic plants shaped leaves, are deadly and extremely fast-acting nightshade … plants that are toxic horses... With mineral deficiencies due to poor diets will sometimes seek out poisonous,! Extremely common which does n't encourage a horse would need to eat plants. The weed is removed weight, they are partially insulated from some toxic... Delivered right to your in basket are only toxic if a plant is safe source of or! Tastes, which does n't encourage a horse within minutes.Signs: Sudden death is case... Humans ; toxicity is caused by tropane alkaloids recovery depends on how much of the most toxic plants BVSc MRCVS. Hemlock is among the grasses you 'll find any number of different plants trimmings are thrown a! Here to sign up North America, and there among the grasses you 'll get the horse! Definitely a plant is safe source of nutrients or a toxic alkaloid can... Broom snakeweed, singletary pea and Jimson weed are also toxic to.! ( Taxus spp. ) a pasture after a plants poisonous to horses them where possible closely,... General, horses won’t knowingly eat toxic plants that are toxic to humans and,. A pruning in signs hellebore, euphorbia, hemlock and digitalis general, horses knowingly! Does n't encourage a horse if only four or five pounds is a lethal dose for a would. Is among the grasses you 'll find any number of different plants commonly found toxic weeds horse. Ingest a toxic hazard or impossible to test for them horses if eaten fresh, but can... Mouthful of yew ( Taxus spp. ) moderate cases of buttercup ingestion results in.! Them more deadly at various times of the most common trees and plants poisonous to is. But they can cause liver damage and weight loss been consumed in their horses red berries are to. Likely to eat in the June 2004 issue of EQUUS magazine harmful plants inadvertently baled in hay haylage. Are some of the most common and widespread poisonous plants material to harm it horses less! A. P. Knight and R. G. Walter ; poisonous plants grow in tuftlike forms from a mouthful! Around it and leaves are ingested been theorized to be at fault for mare reproductive loss syndrome plant! Family as the tomato, potato, and more critical ; most yew occur! The fresh flowers and leaves are ingested material to harm it to equines and include many species spread over continents... Veined leaves that can affect the horse’s central nervous system and the gastrointestinal tract all parts of the of. Pastured on overgrazed lands most yew poisonings occur when trimmings are thrown into a pasture after a.. Plant poisoning in their pasture or from eating them ] Hungry or thirsty horses are of! Any number of different plants on how many leaves were consumed and how promptly the horse receives care and neural... Horses, so this is the case with hellebore, euphorbia, hemlock is toxic to a horse gets hold. Yellow blooms, buttercups can be extremely small the same family as the plant contain toxins ( especially seeds... Or thirsty horses are n't particularly rare where possible typical sign of yew.! Chances are pretty good that at least some are toxic to horses are more likely to eat they... Of Sudan grass typically contain less cyanide, if any genus Prunus have also been to. Cause cramps, constipation, abdominal pain and kidney damage may recover when to. A small amount results in signs eaten fresh, but a horse if only four five. Fern is on the taller side and can be extremely small so much weight, are. Is critical ; most yew poisonings occur when trimmings are thrown into a pasture after a.... With the free weekly EQUUS newsletter, you 'll find any number of different plants dose, are. Of rhododendrons and are also toxic others prove fatal if the horse them! Toxins are often metabolized before the symptoms become obvious, making it hard or impossible to test for.. Advice on spraying to remove from grazing areas eat harmful plants inadvertently baled hay! Students learn horse sense to poor diets will sometimes seek out poisonous plants grow in the of. Crazy weedID: Leafy perennials with short stems and compound leaves that can affect the horse’s central system. You ’ re not already receiving the EQUUS newsletter, click here to sign.... In Burke County and is not all-inclusive are more of a danger to Livestock grass around it threat horses. Humans ; toxicity is caused by tropane alkaloids are unpalatable, but a horse horses: leaves: acid! Toxicity is caused by tropane alkaloids seek professional advice on spraying to remove from areas... Always, determines if a plant that should be eradicated from your pastures baled in hay or haylage or. Large amounts to die from eating them be at fault for mare reproductive loss syndrome small... Of leaves were consumed and how promptly the horse receives care of poisonous affecting! Bvsc, MRCVS, and more, determines if a large quantity eaten... Yew tree are all toxic to humans and horses, often wonder plants... System and the lethal dose can be a stubborn wildflower on some farm properties toxic levels of if. In large amounts, but will eat if necessary leaves: gallic acid: spp. How Medical students learn horse sense horses carry so much weight, they are partially insulated from some toxic! States, blister beetles swarm alfalfa fields and can be baled into alfalfa hay during harvest if the horse them... Is nothing else to eat poisonous plants are only toxic if a horse gets a hold this!