Greetings.
I am a man in a suit who has fallen into the world of Minecraft.
An automatic sugar cane farm detects a change at the third block with an observer, breaks the second block with pistons, and carries the dropped sugar cane into a chest.
This guide is based on Minecraft Java Edition 1.21.11. It uses photos of the eight-plant model that I built in OjiCra and explains both the layout and the points to check when the farm does not work.
How the Automatic Sugar Cane Farm Works
This build is a long, glass-walled machine.
Its operation has three main steps:
- An observer detects a change at the third block of sugar cane
- The redstone signal activates a row of pistons aimed at the second block
- Hopper minecarts and a hopper carry the dropped sugar cane into a chest
The official Minecraft article Block of the Week: Observer explains that an observer detects changes on the side it faces and emits a two-tick redstone pulse.
Sugar cane growth is one of the changes that the article gives as an example.
Main Materials for This Eight-Plant Model
The OjiCra eight-plant model mainly uses:
- 8 sugar cane
- 8 dirt blocks and adjacent water
- 8 pistons
- 2 observers
- Redstone dust
- 8 rails and 8 hopper minecarts
- A transfer hopper and collection chest
- Solid blocks to support the circuit
- Glass to limit scattered drops, plus lighting
The number of hoppers, glass blocks, and building blocks varies with the chest position and enclosure.
Prepare enough for the place where you plan to build.
From the roof of the cartographer workshop, the eight planting spots can be seen in a straight line.
Build the Water, Planting Bed, and Collection System
First, place the water and dirt in a straight line.
Each dirt block used for planting sugar cane needs water beside it.
Place rails directly below the dirt, then put one hopper minecart under each plant.
Center every minecart beneath its dirt block.
In my first attempt, a minecart sat one block off-center and failed to collect the sugar cane above it.
Connect the minecarts below the floor to the collection chest through a hopper.
The official Minecraft article Block of the Month: Hopper explains that hoppers can collect items from above and transfer them into connected containers below or beside them.
Aim Pistons at the Second Block and Observers at the Third
Place a row of pistons facing the second block of each sugar cane plant.
Because the first block remains planted, you do not need to replant after every harvest.
Aim the observer’s face at the position where the third block of sugar cane appears.
This eight-plant model uses two observers, one at each end.
The piston row activates when a change occurs at either end plant.
It does not monitor all eight plants individually.
Run the Redstone One Block Above the Pistons
Connect redstone dust from the back of the observers to the piston row.
Do not place the dust directly on top of the pistons in this design.
In my prototype, extending pistons broke the dust above them, so the circuit stopped after one activation.
Place solid blocks above the pistons, then run the dust one level higher so the moving pistons do not disturb it.
The official Minecraft guide Researching Redstone also introduces automated builds such as sugar cane harvesters as a use for redstone.
Enclose the Farm and Test the Route to the Chest
Sugar cane broken by pistons can scatter forward, backward, or sideways.
Enclose the planting bed, piston row, and collection area with glass to reduce the number of items that fly outside the machine.
Once the farm is assembled, extend sugar cane to the third block and test it.
In OjiCra, the observer reacted, the pistons moved, and the broken sugar cane traveled through the hopper minecarts and hopper into the chest.
All 11 pieces shown here came from tests in which I manually placed sugar cane at the third-block position to trigger the mechanism.
During this photo session, I did not observe a complete cycle beginning with natural growth and continuing through detection, harvesting, and collection.
I also did not measure yield over a fixed period, so this article does not claim an hourly efficiency figure.
Five Things to Check When It Does Not Work
### Is the observer face aimed at the sugar cane?
Observer direction matters.
Aim the face at the position of the third sugar cane block.
### Are the pistons aimed at the second block?
Aim the extending face of each piston at the second sugar cane block.
Do not use a layout that breaks the first block.
### Does the redstone dust remain after the pistons move?
Some layouts break dust placed directly above an extending piston.
Raise the circuit with solid blocks and confirm that the wiring remains after activation.
### Are the hopper minecarts centered under the dirt?
A minecart shifted into the neighboring block may fail to collect an item directly above the planting block.
Place it under the dirt and in the center of the block.
### Are the hoppers facing the chest, and is the farm enclosed?
Check that the transfer hopper points toward the chest.
If sugar cane escapes the machine, add glass to the front, back, ends, and upper area.
Turn Collected Sugar Cane into Paper and Trade It
Place three sugar cane in a horizontal row on a crafting table to make three paper.
Paper is used for maps, books, and firework rockets.
It can also appear in trades with cartographer villagers.
My cartographer offered one emerald for 24 paper.
Check the trade and required amount shown by your own villager.
The story of building this farm in the castle town appears in OjiCra Season 3 Episode 54.
The older Bedrock Edition build remains separate as our 2017 automatic sugar cane harvester record (Japanese).
Frequently Asked Questions
Q. At what height should sugar cane be harvested?
A. Aim the pistons at the second block so that they break the upper section while leaving the first block planted.
Q. Which way should the observer face?
A. Aim the face-pattern side at the position of the third sugar cane block.
Q. Can a hopper collect the sugar cane by itself?
A. A hopper can collect items that fall into its collection area. This build combines hopper minecarts below the dirt with a hopper under the floor.
Q. Why is the sugar cane not entering the chest?
A. Check the minecart positions, hopper direction, and whether items are scattering outside the enclosure. Also confirm that redstone dust remains after the pistons activate.
Q. Does this exact build work in Bedrock Edition?
A. This guide is based on a farm built in Java Edition 1.21.11. Observer behavior and other mechanics can differ between Java and Bedrock, so this article does not guarantee the same layout in Bedrock Edition.
References
- Block of the Week: Observer – Minecraft
- Researching Redstone – Minecraft
- Block of the Month: Hopper – Minecraft
- Yuzukaki’s Java Edition automatic sugar cane farm (Japanese)
- OjiCra Minecraft Memo archive
The observer direction, piston height, and collection position under the floor are the three most important parts of this automatic sugar cane farm.
Before leaving it to grow, trigger the third block once and follow the dropped sugar cane all the way to the chest.
That is all for this time.
Farewell.