Minecraft wiki entry for Gathering_resources_on_peaceful_difficulty, associated text: The easiest way to get bone meal is by using a composter, usually using items from a farm. For example, if you have too much cactus from a cactus farm, or seeds from a wheat farm, just put them into the composter and you will get bone meal after composting it several times. This is the best way to get bone meal without traveling to the nether, as you just need a composter to transform plant-related items or blocks into bone meal.