HEIGHT: Low beds are less function to build and fill, but call for double digging to prep soil beneath the bed. Substantial beds mean a lot less digging and less stooping, but need more soil and making components. Eleven inches is a common peak: that’s two 2x6s stacked on edge. https://andrewdhmx.alltdesign.com/a-review-of-cedar-for-raised-garden-beds-47229418