I think everyone should check everything in their horses field just to make sure that there is nothing in there that will hurt them. If you see a plant or tree that you are unsure about look it up and call your vet and ask them if it is harmful to your horse(s).
Thank goodness, the good Lord gave most horse the good sense not to eat most plants that are not good for them.
agree with PKL some horses are blessed with good "horse sense" on what to eat and what not eat. I'm lucky have some good ones that know better.
Thanks for the remeinder, many plants are not good for the horses, and usually they know more than we do. But its good to be awhere of the plants ahead of time, so they can be removed.
Spring is a good time to check over the pastures for dangerous weeds and other items winter has left behind.....perhaps that lost halter.