Review Of How Tall Should A Raised Garden Bed Be Michigan Ideas. For best results, there should be another 12″. This will also reduce their watering needs as the extra depth allows more water to be retained through drier periods.

Web the raised bed on concrete needs to be at least 32 inches tall in order to give the roots the room to grow and the nutrition to do so. Web just an idea is given to you to understand the size and length of a wooden raised garden bed. Soil depth and root growth:
