Are nettles ivy bramble hawthorn poisinous to horses?

Nettles are not poisonous to horses and can actually provide some nutritional benefits, but they may cause irritation if ingested in large quantities. Ivy is considered toxic to horses and can lead to gastrointestinal issues if consumed. Bramble (blackberry) is generally safe for horses, though the thorny stems can pose a physical hazard. Hawthorn is also safe in moderation, but excessive consumption may lead to digestive upset.