The Best Raised Bed Vegetable Garden Soil Depth Ideas. The minimum depth for most vegetables and greens would be about 8in (20cm), with some preferring 12in (30cm). Web for plants with expanding roots like carrots, start shallow and add soil as roots enlarge.

Soil and compost are then filled into the raised beds to a depth just a few inches (8 cm.) below its rim. Web what is the best soil composition for raised vegetable beds? Learn about varying requirements based on plant types for optimal growth.