Famous Lowes Raised Bed Garden Dirt References. It covers soilless potting mix, the best potting soil for raised beds and more. Cardboard (keep the packaging of your raised garden beds for this step!) layer 2:

Web what is a good raised garden bed soil mix? Measure the bed up to work out the volume you need, length x width x depth will give you cubic metres. Mulch controls weeds and helps plants retain moisture, especially in hot weather.