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Simply because raised beds are raised, they can be harder on the back to mulch. Buckwheat hulls, while more expensive than wood mulch or leaf mold, are a great option: They're very light and easy to spread, they're decorative, and add nutrients to the soil as they rot down. As with any mulch, keep the hulls from touching the base of the plants themselves, and don't mulch too deeply. Two inches is adequate, four inches is too much.