Planting a perennial food plot on a hilltop, hillside or in lighter, upland soil? Try Whitetail Institute Imperial Whitetail Alfa-Rack Plus. Whitetail Institute’s R and D team designed Alfa-Rack Plus to produce an extensive deep-root structure that helps plants thrive on hilltops and hillsides. Alfa-Rack Plus is a blend of grazing Alfalfas which are high-protein, drought and cold tolerant. Grazing alfalfas have more leaf relative to stem and are more palatable to deer than ordinary hay alfalfas.