I don't know the answer to that, Pam. I had a friend here in Starkville that bought 15 lbs. last summer and he decided that he wanted to grow garlic. He used only Earth Boxes. I think he treated those two boxes like you would a tub/pot, and just fertilized and watered like usual. He said he had none of the covers than come with those boxes and didn't remember how he was supposed to use them. I have seen pictures of his garlic (he depends on me to tell him whether it all looks good and when to harvest
) and it all looks just fine to me. I planted late, late, late and used the boxes as directed. I plan on using these three again this fall but I am going to simply treat them like an ordinary planting tub, no cover, no central mound of fertilizer, and will water it/let rain fall on it like I would my garden. I am quite sure that will work as well as the large pots I use now.