I spread layers of cardboard about an inch thick - 4 or 5 layers. I then put down cardboard boxes that were not flattened. They're about 30 inches square and about 18 inches deep. In the bottom of the boxes, I put about two inches of newspaper and put composted leaves and chicken bedding on top of that. I filled them up to within about three inches of the top. The spinach and kale have sprouted. The garlic is up and growing. The cabbages are taking off. I'm so proud. I hope they all live long enough to be ripped from the ground, chopped up, exposed to heat and eaten by the humans.