@Frillylily.
You are right. Nothing seems to eat the garlic tops and the squirrels have never dug up the cloves/bulbs. The garlic is my only "winter-crop". The fencing was done to keep the deer and rabbits out when I plant crops in the spring. Though the fencing is only about 5' tall, the deer won't jump over it. I plant so much stuff in the spring that I guess the deer don't see a "safe-spot" to land. They could certainly jump over that fence if they wanted to.
