Ask the Nutritionist: Dr. Getty's Forum for Equine Nutrition
Welcome to my forum.
Here you will find more than 6 years of questions and my answers. It is searchable and offers a great deal of information.
Currently, I am discontinuing new questions. This may change in the future, but in the meantime, please know that It has been a true pleasure serving you.
Take a look at my Nutrition Library and Tips of the Month for a variety of answers on selected topics. Be sure to sign up for my monthly e-newsletter, Forage for Thought.
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All the best,
Dr. Getty
Hello Pat,
I have not heard anything against palmetto branches or grave vines, but I can tell you that oak tree leaves are toxic over the long term. In other words, they will not immediately cause a problem, but over time, can cause liver damage.
Most horses will avoid oak leaves, however the acorns are especially tasty and are toxic. So, I recommend removing oak trees from your horse's reach (unless they leave them alone).
A periodic liver enzyme check is a good idea if you have plants that your horses periodically eat that concern you.
Best wishes for the new year,
Dr. Getty 
Author of Feed Your Horse Like A Horse
Where are you from? Bayfield, CO