Minecraft wiki entry for Cocoa_bean_farming, associated text: Planting cocoa beans on the 4 sides of a log makes it harder to replant, so a wall of jungle wood makes the fastest design possible. For a compact design, the wall must be also partially underground so as to make the most out of your planting reach. This design uses dispensers, that are cheaper than other design's pistons, and the use of redstone is minimum. The design is modular, with units of one dispenser and 3 blocks wide wall.