Composters arrived in Minecraft Java Edition with the 1.15 update in December 2019

The composter block was introduced to Minecraft Java Edition on December 10, 2019, as part of the 1.15 "Buzzy Bees" update. Bedrock Edition received composters slightly later, in the 1.14.0 update released in December 2019 as well. Before this update, there was no way to convert plant materials and food scraps into bone meal through gameplay — you had to find bone meal in loot chests or craft it from bones dropped by skeletons.

The composter was added alongside other farming and gardening features in the same update, including beehives, honey blocks, and new plant varieties. Mojang designed the composter to give players a renewable way to produce bone meal, which is essential for speeding up crop growth and breeding animals.

Key Takeaways

  • Composters were added to Java Edition in the 1.15 update on December 10, 2019, and to Bedrock Edition in version 1.14.0 the same month.
  • The composter converts plant-based items and food scraps into bone meal through a layering system where each item has a different fill percentage.
  • You craft a composter using seven wooden slabs arranged in a U-shape on the crafting table, with no center block.
  • A full composter produces one bone meal when you right-click it or when a hopper pushes the final item into it.
  • Composters are the only renewable source of bone meal in vanilla Minecraft survival mode without trading with villagers.

How the composter filling system works

The composter uses a fill level system rather than storing individual items. Each compostable material adds a set percentage to the composter's fill bar when you place it inside. Common items like seeds add 30 percent, while more nutrient-rich materials like melon slices add 50 percent. When the fill bar reaches 100 percent, the composter automatically produces one bone meal and resets to empty.

You can watch the composter's fill level by looking at the compost inside — it visually rises as you add more materials. This makes it straightforward to see at a glance how close you are to getting bone meal. The composter accepts over 100 different compostable items, including all crops, seeds, flowers, leaves, and food scraps like bread and cookies.

Crafting and placing a composter

To craft a composter, you need seven wooden slabs of any type — oak, spruce, birch, jungle, acacia, dark oak, or mangrove all work. Arrange them on the crafting table in a U-shape: place three slabs across the top row, one slab on each side of the middle row, and two slabs across the bottom row, leaving the center empty. This gives you one composter block.

Place the composter on solid ground where you have room to access the top. You can place composters side by side or stack them vertically, and they work independently of each other. Composters are not affected by water or fire, so you can build them near your farm without worry.

Using hoppers and automation with composters

A hopper can push items into a composter from above, making it possible to automate bone meal production. When a hopper feeds the final item that fills the composter to 100 percent, the composter ejects the bone meal automatically. You can then place another hopper below the composter to catch the bone meal and send it wherever you need it.

This setup is useful for large farms where you need steady bone meal production. Connect your hopper to a chest or storage system, and bone meal will accumulate over time as you feed plant materials into the top hopper. Many players build composter chains — rows of composters fed by hoppers — to produce bone meal at scale.

Which items compost and their fill percentages

Compostable items fall into four categories based on how much they fill the composter. Items like seeds, grass, and small flowers add 30 percent. Medium-value items like wheat, carrots, potatoes, and beetroot add 50 percent. High-value items like melon slices, pumpkin slices, and cake add 50 to 65 percent. The most nutrient-rich items — dried kelp, nether wart, and cocoa beans — add 85 percent.

Leaves from trees are also compostable and add 30 percent per block, making them a good way to use up leaves when you harvest wood. Flowers, both small and tall varieties, compost at 65 percent. Hay bales are the most efficient single item at 85 percent, but they require crafting from wheat. Bones themselves cannot be composted — only plant materials and food made from plants.

Why composters matter for survival mode farming

Before composters existed, bone meal was a limited resource in survival mode unless you found it in loot chests or killed enough skeletons. Now you can turn the byproducts of farming — seeds you don't need, crop failures, and excess vegetables — into bone meal to speed up your next harvest. This creates a sustainable cycle where your farm feeds itself.

Bone meal is crucial for breeding animals and growing crops quickly. With a composter, you can breed cows, sheep, and chickens without waiting for grass to regrow, and you can grow trees and crops in a fraction of the normal time. This makes the composter one of the most practical blocks to build early in a survival world.

Composters in different Minecraft editions

Java Edition and Bedrock Edition both have composters that work the same way mechanically, though Bedrock Edition received the feature about the same time. If you play on a server or realm, the composter will function identically. The only difference is that some older worlds created before the 1.15 update will not have composters in the world generation, but you can craft and place them manually.

Snapshot and beta versions of Minecraft sometimes introduce changes to how composters work, but the core mechanic has remained stable since 1.15. If you are playing on the latest version, you can rely on composters working as described here.

Frequently Asked Questions

Can I use a composter to get bone meal without a hopper?

Yes. You can manually place compostable items into the composter by right-clicking it. When it fills to 100 percent, it automatically produces bone meal that pops out as an item you can pick up. This is slower than automation but requires no redstone or hoppers.

What is the fastest way to fill a composter?

Hay bales fill the composter 85 percent in a single item, so you only need two hay bales to produce bone meal. However, hay bales require nine wheat to craft. If you have excess seeds or small crops, using multiple lower-percentage items is often faster overall.

Do composters work in creative mode?

Yes, composters function in creative mode the same way they do in survival mode. You can use them to test farm designs or practice automation before building in survival.

Can I compost bone meal itself?

No. Bone meal cannot be composted, and neither can bones. Only plant-based items and food made from plants are compostable.

Do composters need light to work?

No. Composters work in complete darkness and do not require any light level to function. You can bury them underground or build them in caves without any issues.