What can I grow,that is nutritious for the deer, in NW OKla when I have rainfall of 18" or so annually?? The soil is sandy, of course, but pH balanced. I would suggest a product called "EXTREME". This blend will survive with 15" of annual rainfall and is high in protein. The bag contains a plant that has a very deep tap root and looks like parsley. I have used it for some time and the deer relish it. The plant will do well in poor soil too. This is another fine product from The Whitail Institute of North America