Minecraft wiki entry for Mushroom_farming, associated text: This method relies on thorough lighting to ensure a monster-free, no-mining-required farm for the beginner mushroom farmer. Create a room two blocks high and as large horizontally as desired. At regular intervals dig one block up into the ceiling of your room, and place a torch to create recessed lighting. This will cast light of level 12 at floor height, allowing mushrooms to grow and spread. You can place torches at a distance of up to six squares between each other with no danger of mobs spawning. This setup will allow for the fastest mushroom growth. Spread the mushrooms on the floor with room around them to grow and wait.