Composting fills a composter block with layers until it reaches level 7, then produces bone meal you can harvest

A composter is a block that converts plant material into bone meal through a layering process. You place compostable items into the composter one at a time. Each item has a chance to raise the compost level by one layer. When the composter reaches level 7 (full), it produces one bone meal that you can collect, and the composter resets to empty.

Bone meal is the real output you are after. It speeds up crop growth, flowers, grass, and tree saplings. A single bone meal can mature a wheat plant when ready or push a sapling several growth stages forward. Without a composter, you would need to find bone meal from skeletons, fossils, or fishing — all slower than farming compost.

The composter works on probability. Not every item you add will raise the level. A seed might have only a 30 percent chance, while a pumpkin has a 100 percent chance. This means you cannot predict exactly how many items you need to fill one composter, but over time the math works out: roughly 7 to 10 items per full composter, depending on what you use.

Key Takeaways

  • A composter converts plant scraps into bone meal through seven layers, and you harvest the bone meal when it fills.
  • Bone meal speeds up crops, flowers, grass, and saplings, making it essential for large farms and tree farms.
  • Different items have different success rates — seeds are unreliable, but pumpkins and melons always work.
  • You can automate composters with hoppers to feed items in and collect bone meal out, turning farm waste into a steady supply.

Which items work in a composter and their success rates

Plant-based items compost, but not all at the same rate. Seeds, grass, and leaves have low success rates (around 30 percent), so they raise the level only sometimes. Crops like wheat, carrots, and potatoes have medium rates (around 65 percent). Pumpkins, melons, hay bales, and cake have 100 percent success rates and always raise the level by one.

Flowers, vines, seaweed, and mushrooms also compost at varying rates. Bamboo and sugar cane work at 50 percent. Dead bushes and dried kelp are reliable. Saplings and tree leaves do not compost at all, which surprises many players — you cannot recycle a tree farm's trimmings into bone meal.

The practical strategy is to save high-rate items (pumpkins, melons, hay) for your composter and use low-rate items only when you have excess. If you are running a large farm, you will generate plenty of carrots and potatoes anyway, so feed those in and let the composter fill gradually.

Using bone meal from your composter

Bone meal has three main uses. First, it forces a growth stage on crops, flowers, grass, and saplings. Right-click a wheat plant with bone meal and it advances one stage; right-click a sapling and it may grow into a full tree when ready. This is how you speed up food production and build tree farms without waiting.

Second, bone meal colors wool and other blocks in specific crafting recipes. This is a minor use compared to farming, but it matters if you are building large structures and want to dye wool in bulk.

Third, bone meal can be crafted into bonemeal blocks for decoration, though this wastes the farming benefit. Most players use bone meal directly on crops rather than storing it as blocks.

Setting up an automated composter

A single composter is slow if you feed it by hand. To automate it, place a hopper on top of the composter and another hopper below it. The top hopper feeds items in; the bottom hopper collects bone meal when the composter fills. Connect the hoppers to your farm's output using more hoppers or a water stream to push items along.

You can run multiple composters in parallel. If you have a large farm producing hundreds of items per hour, one composter will not keep up. Build three or four composters in a row, each with its own input and output hoppers, and feed them from a central collection point. This spreads the load and produces bone meal faster.

Composters do not require power or fuel. They work purely on the items you feed them, making them one of the simplest automation projects in Minecraft. A beginner can build a working composter farm in minutes.

Comparing composters to other bone meal sources

Skeletons drop bone meal when killed, but skeleton farms are complex to build and require a spawner or dark room. Fishing can produce bone meal as junk loot, but it is slow and unreliable. Fossils buried underground contain bone blocks that you can craft into bone meal, but they are rare and finite.

A composter is renewable because you can farm plants infinitely. Once you have one composter running, you have a steady supply of bone meal as long as you have crops. This makes it the most practical source for most players, especially early in a world when you are still building infrastructure.

The trade-off is time. A composter fills slowly compared to a skeleton farm, but it requires far less setup and no dangerous mob grinding. For a casual player or a survival world where you want to avoid complex redstone, a composter is the right choice.

Composters in different Minecraft versions

Composters were added in Java Edition 1.14 and Bedrock Edition 1.10. They work the same way in both versions: items go in, bone meal comes out at level 7. The list of compostable items has expanded slightly over updates, but the core mechanic has not changed.

If you are playing an older version, composters may not exist. Check your version number in the launcher. If you are on 1.13 or earlier in Java, or 1.9 or earlier in Bedrock, you will need to use skeletons or fishing for bone meal instead.

Frequently Asked Questions

Can I speed up a composter by putting more items in at once?

No. A composter accepts only one item at a time. If you try to place multiple stacks, only one item from one stack will go in. You must feed items one by one, either by hand or through a hopper.

What happens if I put a non-compostable item in a composter?

Nothing. Non-compostable items like dirt, stone, or wood will not go into the composter at all. The composter straightforward rejects them. Only plant-based items can enter.

Do I need a composter or can I just use a skeleton farm?

A skeleton farm produces bone meal faster once built, but requires a spawner and complex redstone. A composter is simpler and works when ready with just hoppers. Choose a composter if you want quick results; choose a skeleton farm if you want maximum output later.

Can I use bone meal on trees to make them grow faster?

Yes. Right-click a sapling with bone meal and it will grow into a full tree, often when ready. This is one of the main reasons to run a composter — you can build a tree farm that produces wood much faster than waiting for natural growth.

How many composters do I need for a large farm?

It depends on your farm size and how much bone meal you use. A small crop farm with one composter will keep up. A large farm producing thousands of items per hour will need three to five composters running in parallel to generate enough bone meal for your needs.