Step 2: For this step you will need cardboard- the amount will depend on the size of the bed you are trying to make. I just simply rip the pieces up and put the cardboard down like a puzzle piece until the area is covered with the cardboard. If the ground is uneven in the area you’ve chosen, no worries, you can use more cardboard on those areas to build the height of the section to match the surrounding area. The next step will allow you to build up the height of your bed as well. As you can see in the photo, we began to place leaves and grass clippings on top of the cardboard.