How to Build an Automatic Sugar Cane Farm
Unlimited paper for books, bookshelves and maps. The observer-and-piston design that harvests itself and never needs replanting.
Sugar cane becomes paper, and paper becomes books, bookshelves and maps. A full enchanting setup needs 15 bookshelves — that is 45 books and 135 sugar cane — and that is before you start making maps. An automatic farm solves the whole problem permanently.
How sugar cane grows
Three rules govern everything:
- It grows only on sand, red sand, dirt, grass, podzol or coarse dirt.
- The block it sits on must be adjacent to water — directly beside, on any of the four horizontal sides.
- It grows up to three blocks tall, one segment at a time, on a random tick.
Critically, breaking the middle or top segment does not destroy the plant. The bottom block stays and regrows. That is what makes a self-harvesting farm possible with no replanting at all.
The core mechanism
The standard design is a row of sugar cane with:
- An observer facing the second block of each plant.
- A piston that breaks the cane when the observer fires.
- Water or hoppers below to collect the drops.
When the cane grows to its second block, the observer detects the block change and pulses the piston, which breaks the cane above the base. The base survives, the drops fall, and the cycle repeats forever with no clock and no player input.
Building it step by step
- 1.Lay a row of sand or dirt with a water channel running alongside it, so every planting block touches water.
- 2.Plant sugar cane along the row.
- 3.Place observers facing the second block of the cane, one per plant, in a line behind them.
- 4.Place pistons above or beside the observers so that when triggered they break the cane's upper segments.
- 5.Run the observer output to the pistons. In a straight row they can share a redstone line.
- 6.Put water or a hopper line beneath the cane so broken drops flow into a collection point.
- 7.Hoppers into a chest.
Build the row as long as you like — the mechanism repeats identically, and longer rows simply mean more throughput.
Making paper and books
- 3 sugar cane = 3 paper.
- 3 paper + 1 leather = 1 book.
- 6 planks + 3 books = 1 bookshelf.
Leather is the other half of the equation. A cow farm supplies it, and so does an AFK fish farm as a side product. Once both run, bookshelves stop being a constraint.
Paper is also the base of maps — see our maps guide — and of firework rockets, which matters enormously if you fly with an Elytra. Pair this farm with a creeper farm for gunpowder and rockets become unlimited.
Trading paper for emeralds
Librarian villagers buy paper for emeralds, and the trade is one of the better emerald rates in the game for a fully automatic input. If you have a trading hall — our villager jobs guide covers setting one up — routing this farm's output into paper and selling it turns sugar cane into a steady emerald income with no further effort.
Common problems
Cane will not grow. The block underneath is not adjacent to water, or it is not a valid soil type. Check every planting block touches water on at least one side.
Observers firing constantly. They are detecting something other than the cane — usually a piston or another observer in view. Reposition so each observer only sees its plant.
Drops despawning. Items landing outside the water or hopper coverage. Extend the collection layer under the full row.
It works but slowly. Sugar cane grows on random ticks, so a short row is genuinely slow. The fix is length: double the row, double the output. There is no way to speed up an individual plant.
Bamboo does this better for fuel
If what you actually want is fuel rather than paper, build a bamboo farm instead. Bamboo grows far faster than sugar cane and uses the same observer-and-piston mechanism, so if you have built one you can build the other in minutes.