List Of Depth Needed For Raised Garden Bed Ideas. For compact herbs, plants, and flowers, the depth can be as little as six to eight inches. If you need to improve the drainage with the rubble, then the rule with bulbs is they need to have at least twice their own depth in.

What’s the average depth of a raised bed the average depth of a raised garden bed is 11 inches (two 2×6 boards) and is 4 feet wide by 8 feet long. The university of georgia also suggests the following raised garden bed depths for ergonomic and adaptive gardening: You need to make raised garden beds that are at least 30 centimeters deep.
