· in my experience, a raised bed should be at least 6 to 8 inches deep. When you look at your standard raised bed size, which is three to four feet wide, by six to eight feet long, the structure is usually at least 10 to 12 inches (25 to 30 cm) high. Double-digging refers to two shovel blade lengths, or approximately 24” in depth. In this guide, we’ll help you determine the best depth for your raised beds and how much soil you need to fill them. · but how deep should a raised garden bed be to gain the most benefit for your plants? However, if i plan to welcome plants with deeper root systems, i aim for a depth of 12 to 24 inches. This depth supports most plants, including several varieties of vegetables and herbs. · learn how deep your raised garden bed needs to be for optimal plant growth. Find out the benefits of 12 to 18 inches of soil depth and how to design and layer your bed for optimal growth. Learn how to choose the ideal depth for your raised garden beds based on plant types, soil quality, and climate. Based on the plants i choose to cultivate, the depth can vary. Discover ideal depths for vegetables, herbs, and more. This only needs to be done once and is much easier if done before the raised bed is assembled in place. · the minimum required depth depends on the plant, but on average a raised garden bed should accommodate about 20 inches of soil for the roots of flowers and vegetables. · how deep should a raised garden bed be? When first setting up a raised bed , gardeners should ‘double-dig’ the soil beneath the raised bed.
