I bought some cloves of 7 years ago. Elephant garlic tastes milder than regular garlic.Climate Change has changed the behavior of garlics. The warm November led to the sprouting of the unharvested cloves of elephant garlic that were supposed to pop up in spring. But they are surprisingly cold hardy. And they all survived a couple of weeks of 20s this winter.
My elephant garlic isn't planted too deep. I just dig a 1-2 inch hole. I interplant it with strawberries (and other vegies) which is bad for the strawberries. But Strawberries cover the ground pretty well. I can get some strawberry runners and transplant them somewhere else.
When I harvest my elephant garlic in late summer. I will just put some back to the soil. Here in hardy zone 8b, a warm Nov, it will sprout when it rains. With a normal Nov, it will sprout in spring.