Step 5: The final step is to pile the dirt on top of the cardboard and organic matter. If your barrier is not built yet pile the soil into a big pile- keeping it away from the edges. Before you can spread the soil throughout the bed, I would recommend making a barrier surrounding the bed. We used small rocks that we had a surplus amount of and a piece of plastic which was formerly part of a retaining wall we took down.
You can use anything to make the barrier and I recommend getting creative. Some materials I’ve used before are: bricks, logs, thick sticks, and rocks. If you have lumber and tools you can also build a more permanent garden bed structure. There should be plenty of garden bed blueprints online. Once your retaining wall is built you can spread your soil evenly across the foundation of the bed until you have all of the cardboard, and any other organic matter you chose to put down, covered.
You are now ready to begin seeding your garden. Happy Planting!