Can you compost bamboo or fish?

No. Despite being a plant, bamboo cannot be composted, and only plant-like items work at all, so fish, meat and other animal products are rejected. Seeds, leaves and crops are the standard fuel.

How many layers does a composter need before bone meal is ready?

Seven layers fill the composter, after which the top changes appearance to show it is finished. Interacting with it then collects one bone meal and resets it to empty.

How do you reset a farmer villager's trades with a composter?

Break the composter and place it back down. As long as you have never traded with that farmer, his offers reroll each time he reclaims the workstation. Trading even once locks the trades forever.

What redstone signal does a full composter give?

A comparator reads 0 from an empty composter, one point per compost layer, and 8 from a finished composter holding bone meal. Hoppers can feed the top and drain the bottom, but not the sides.

5 Best Uses of the Composter in Minecraft

Every Minecraft base produces embarrassing amounts of plant junk: seeds you will never plant, leaves, spare saplings, the odd pumpkin glut. The composter is the block that turns all of that clutter into something valuable, and then keeps finding extra jobs to do around the village. Here are its five best uses, starting with the obvious one.

1. Turn Plant Waste into Bone Meal

Right-click a composter while holding a compostable item and the item disappears into the mix. Each successful addition raises the compost by one layer, shown as the fill rising inside the wooden bin, and after seven layers the contents finish with a podzol-like top. One more click collects your bone meal and empties the block ready for the next batch.

Not everything composts at the same speed, though. Every item has a set chance of adding a layer, and knowing the tiers stops you wasting good food where seeds would do:

Chance to add a layer	Example items
30%	Seeds of all kinds, leaves, saplings, seagrass, sweet berries, glow berries
50%	Cactus, dried kelp, melon slices, sugar cane, vines, tall grass
65%	Apples, carrots, potatoes, pumpkins, flowers, cocoa beans, moss blocks, mushrooms
85%	Baked potatoes, bread, cookies, hay bales, mushroom blocks
100%	Cake and pumpkin pie, the guaranteed finishers

One warning: bamboo, despite being a plant, refuses to compost at all, and neither does anything that is not plant-like, so keep your fish and meat out of it.

2. Give a Villager the Farmer Job

The composter is the farmer's workstation block. Place one near an unemployed villager and he claims it, pulls on the farmer's hat and starts offering crop trades. If his first set of trades disappoints you, break the composter and place it again to reroll them, as long as you have not traded with him yet. Once you do trade, the offers lock in permanently, so reroll first and commit second.

3. Automate It into a Bone Meal Farm

Hoppers make the composter hands-free. Because the composter is not a full block, a hopper underneath can pull the finished bone meal straight out, while a second hopper on top feeds fresh items in. Link a chest of farm waste to the top hopper and a collection chest below, and you have a simple bone meal farm that quietly processes everything your crop fields throw away. The only quirk to remember is that hoppers cannot interact with the composter's sides, only the top and bottom.

4. Read It with a Redstone Comparator

Here is the use most players never discover. A comparator reading a composter outputs a signal that matches its fill level: empty gives 0, each compost layer adds one, and a finished composter with bone meal waiting gives the maximum of 8. Because items succeed only by chance, that signal climbs unpredictably, which makes composters a favourite ingredient in redstone randomisers and in circuits that need to know when a farm has finished processing.

5. Tune a Note Block to Bass

Finally, a small musical one. Slide a composter underneath a note block and the instrument changes to the deep bass sound. It is a niche trick, but if you are building note block music, having a cheap wooden block that unlocks the bassline is genuinely handy, and it means the composter earns its keep even in a concert hall.