The Composter Turns Plant Materials Into Bone Meal

A composter is a block in Minecraft that converts plant-based items into bone meal through a layering process. You fill it with may be able to access materials—seeds, leaves, crops, flowers, and similar items—and each addition has a chance to raise the compost level. When the composter reaches full capacity, it produces one bone meal that you can collect.

The composter is one of the few renewable ways to get bone meal without killing skeletons or finding it in loot chests. This makes it especially useful for large farming or building projects where you need steady bone meal supply for bonemeal-based growth acceleration on crops and trees.

Key Takeaways

  • Each material you add to a composter has a specific chance to raise the fill level, ranging from 30% to 100% depending on the item type.
  • When the composter reaches 100% full, it automatically produces one bone meal that drops as an item you can pick up.
  • Different plant materials have different success rates—seeds are less likely to raise the level than crops or flowers.
  • You can automate composters with hoppers to create a fully hands-off bone meal farm.

How to Fill a Composter Step by Step

Place the composter on the ground and stand next to it. Hold any may be able to access plant material in your hand and right-click (or use your interact button) on the composter's top surface. The material will disappear, and the compost level inside will either stay the same or increase by one layer.

Keep adding materials one at a time. You will see the brown compost inside gradually rise as you add more items. The fill level is divided into seven layers, and you need to reach all seven to trigger bone meal production. Each material has its own success rate—some items almost always increase the level, while others only have a 30% chance.

When the composter reaches the top (layer 7), it will automatically produce one bone meal item that pops out the top. You can then collect it and start filling the composter again. There is no limit to how many times you can use the same composter.

Which Materials Work and Their Success Rates

Not every plant item works in a composter, and the ones that do have different odds of raising the fill level. Materials fall into three categories based on their success rate.

30% success rate items include seeds (wheat, beetroot, pumpkin, melon), small dripleaves, and glow berries. These are the least reliable—you may need to add several seeds before the level rises.

50% to 65% success rate items include grass blocks, seagrass, kelp, mushrooms, nether sprouts, and warped fungus. These are moderately useful for filling the composter.

85% to 100% success rate items include crops (wheat, beetroot, carrots, potatoes when fully grown), flowers, leaves, hay bales, and sugar cane. Cactus and bamboo also work at 50%. These materials are the most efficient for quickly filling a composter.

Automating a Composter With Hoppers

You can connect a hopper above the composter to automatically feed it materials. Place a hopper directly on top of the composter block, then place another hopper or chest above that one to hold your plant materials. Items will flow down into the composter automatically.

Add a second hopper below the composter to catch the bone meal when it drops. This hopper can feed into a chest or another storage system. With this setup, you can walk away and let the farm produce bone meal without clicking anything.

For a larger operation, you can build multiple composters in a row, each with hoppers above and below, and connect them all to the same storage chest. This creates a passive bone meal farm that works while you do other things in your world.

Common Mistakes to Avoid

Do not add items that are not plant-based. Dirt, sand, wood planks, and other blocks will not work in a composter—you will just waste them. Stick to seeds, crops, flowers, and leaves.

Do not expect every item to raise the level. If you add a seed and nothing happens, that is normal. The 30% success rate means you may need to add three or four seeds before the level moves up. This is not a bug; it is how the composter is designed.

Do not forget to collect the bone meal. When the composter fills completely, the bone meal pops out the top as a loose item. If you are not watching, it may despawn after five minutes. Use hoppers to catch it automatically if you are building a farm.

What You Can Use Bone Meal For

Bone meal is a fertilizer that when ready grows crops, saplings, grass, and other plants to their next stage. Right-click a crop with bone meal in your hand to speed up its growth. This is especially useful for tree farms and crop farms where you want to harvest faster.

Bone meal also works on grass blocks to spread grass and flowers across dirt. You can use it to quickly create a grassy area or generate flowers for decoration or dye production.

Frequently Asked Questions

How long does it take to fill a composter?

It depends on which materials you use. With high-success-rate items like fully grown crops or flowers, you might fill it in 7 to 10 additions. With low-success-rate items like seeds, it could take 20 or more additions. An automated hopper system fills continuously without your input.

Can I use composters in the Nether or End?

Yes, composters work in any dimension. However, you will need to bring plant materials with you. The Nether has nether sprouts, warped fungus, and crimson fungus that work in composters, so you can set up a bone meal farm there if needed.

What happens if I add an item that does not work?

Nothing happens. The item will not be consumed, and the fill level will not change. You can remove it by right-clicking the composter again. Only plant-based materials are accepted.

Can I get bone meal any other way?

Yes. Skeletons drop bone meal when killed, and you can find it in various loot chests in structures like dungeons and temples. However, a composter is the most renewable method since you can farm plant materials infinitely.

Do I need to craft a composter or can I find one?

You need to craft it. A composter is made from seven wooden slabs arranged in a specific pattern—six slabs form the sides and bottom, and one slab forms the top. You can use any type of wood slab.