Raised garden beds are my preferred way to grow in my urban garden, but filling them can cost a pretty penny. Now, there are MANY ways to fill a garden bed on the cheap, and this is just ONE of them. It makes use of existing organic matter on your property (sticks, logs, brush, grass clippings, unfinished compost, etc.) to fill the bottom half of your bed. Then, fill the remainder with a high-quality mix that you can either buy or make yourself. This method is particularly useful when growing in TALL (18"+) beds, as you don't need the perfect soil mix all of the way down. Over time, the fill material will break down and become food for bacteria, fungi, and other soil life and turn into high-quality soil for your garden over the years.