Tansy contains a poisonous chemical called thujone. Myth 3. People have died after taking as little as 10 drops of tansy oil. Tansy ragwort, Senecio jacobaea, is a noxious weed with poisonous alkaloids that cause irreversible liver damage to animals (and humans) if consumed.All of its parts are toxic, with the highest amount of alkaloids in flowers, then leaves, roots and stems. Although tansy plants are rarely consumed by livestock because of their pungent aroma, tansy can be poisonous if it is eaten, especially in large quantities. It is the time of year when roadsides and pastures glow with golden flowers on long stalks. It is generally unpalatable to livestock and, therefore, is eaten only when other food is scarce or when it cannot be avoided as in hay, ensilage, and lush pastures. Ragwort EIRs: evidence, held by Defra, that supports the assertion “Humans may be at risk from ragwort poisoning through direct contact (e.g. Tansy ragwort contains pyrrolizidine alkaloids, toxins that are found in many other plants that affect horses and livestock. Tansy ragwort is a Class B noxious weed, meaning it is a high priority for removal and is toxic to animals and humans. But are you really going to eat plate-loads of ragwort any more than foxgloves or other poisonous plants that can be found in Britain’s fields or along paths and verges? Tansy is highly toxic to humans and livestock, and when ingested can cause bloody diarrhea, liver failure, and a myriad of other unpleasant symptoms, including death. By JANET STEIN. Tansy ragwort is a weedy, biennial plant that infests woodlands, pastures, and hayfields of the coastal northwest United States. Prevent livestock poisonings by ensuring that the susceptible livestock (especially cattle, pigs and horses) have enough high-quality forage and do not become so hungry that they start eating tansy ragwort. I went outside to check the area around the toxic plant (tansy ragwort) and I stiil found pieces of shredded leaves and small leaves from this plant that she had apparently pulled off while eating it. A lethal dose of tansy ragwort in horses … Ingestion of Tansy ragwort can ultimately lead to scarring in the liver and eventually complete liver failure. Some consider tansy ragwort and Scotch broom — … It is if you eat vast quantities. Ragwort must be removed wherever it’s found. Tansy ragwort can be confused with either or St. John's wort Hypericum perforatum ), since all three grow to about 3 feet tall, have clusters of yellow flowers and bloom in the same part of the year. My beautiful little comet died peacefully in her sleep this morning. 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