Brassica is the answer to your question. Good carb. and protien levels. Grows to about 2 foot. You will, however, need to get your PH to at least 6 before planing. Also, you might want to consider doing some browse cuts and "hindge" cutting of desirable trees. Corn is o.k. but offers very little nutritional value to whitetails. Best if it is mixed with other things suck as alflafa and oats to increase protein levels to sustain body weights. TGK