"If you have something like rabbits or groundhogs, that are digging animals, if you put a fence just to the ground surface, they will easily dig under it," Mr. Parkhurst says. "Burying it with a return will allow them to encounter a fence in front of them and below them. If they try a few inches over and have the same problems, they will very often give up."
"People will have to make some decisions if they want to go to that extent or if a garden is really important for them," Mr. Parkhurst says. "Even with an 8-foot fence, the deer can get over it with a good running start."