Minecraft wiki entry for Tree_farming, associated text: Huge fungi require Bone Meal, Nylium and Fungi to farm. You can make a platform of nylium, apply bonemeal until it generates fungi, then quickly grow the fungi and break the bottom stem to prevent the nylium from decaying. Cut down the fungus, and break the vegetation and nether wart blocks that generate and compost them, along with all the non-fungus vegetation that generates with using the bone meal on the nylium. With luck, you can get enough bone meal to do it all over again. You can always farm some other vegetation to produce enough bone meal to make sure you do not run out.