Question: are hazel trees poisonous to horses?
Answer: Field Maple, Guelder Rose, Hornbeam, Cherry Plum, Dogrose, Sweet Briar, White Ramanas Rose and Red Ramanas Rose, Hazel and Common Dogwood. Stay away from plants such as Spindle, any of the Buckthorns, Holly and Blackthorn. They may be fine for other livestock but they are not suitable for equine hedges.