Just a couple of words to wrap up the manganese discussion. It is what is called an immobile nutrient. That means that the plant cannot move it from the old leaves to the new ones so it is the new leaves which suffer. It usually occurs in alkaline or highly leached soils so sandy Florida is a prime candidate. The symptoms start as interveinal chlorosis and stunting of growth of the new leaves. That can turn into a strange looking twisting at the top of the plant called frazzle top. Palms and cycads are prime candidates for this but I have also seen it on Indian laurel, schefflera, jasmine and other woody plants. Orchids rarely have nutrient problems because they are not dependent on soil. If you are wondering about a particular plant in your landscape, just search on "nutrient deficiencies of plant X" and you will probably find the answer.
Jim
