Fencing

• While effective, installing a fence around the perimeter of the planting area can be costly. The fence must be at least 8 feet high to keep out deer and can be visually unappealing. For a less visible barrier, install electric fencing. These deliver an unpleasant, low-voltage shock to trespassers, which not only scares them away, it keeps them from returning.
  
  

Scented Repellents

• Fertilize newly planted corn with the rotted manure of natural predators. Available at zoos and garden centers, the scent of droppings from carnivores such as tigers and bears will keep animals out of the garden; to enhance the effect, hang mesh bags filled with unwashed hair from surrounding trees. Animals tend to steer clear of any area bearing a strong human scent.
  
  

Plants

• Surround the field with strongly scented shrubs, such as wormwood, as animal pests are put off by the aroma of the foliage. Broadleaf evergreens, such as common boxwood and American holly, also produce an odor that keeps foraging animals at bay. In addition, squash and cucumber can be planted between corn stalks; the prickly leaves and stems annoy raccoons.