Observer Pumpkin Farm (Single Stem) in Minecraft

A single hydrated pumpkin stem triggers a downward piston. Two hoppers collect drops through mud and farmland into a chest.

An original small adaptation of the observer-and-piston pumpkin farming principle, not a block-for-block reproduction of a tutorial. Only the mud cell east of the stem can grow fruit; glass and a sea lantern block the other directions. A downward-facing observer watches the stem, so the piston never enters its observed cell. The observer powers a solid block above it; dust crosses to a second solid block above the downward piston. Harvested drops stay inside the sealed two-cell chamber and are collected through the partial-height mud or farmland. This trades low output for a simple stationary collection system. The complete adaptation has not been tested in game.

Materials

• 12× Stone bricks
• 2× Hopper
• 1× Chest
• 29× Glass
• 1× Water
• 1× Farmland
• 1× Mud
• 1× Sea lantern
• 1× Pumpkin stem
• 1× Observer
• 1× Piston
• 2× Redstone wire
• 1× Water bucket
• 1× Wooden hoe
• 1× Pumpkin seeds

Build steps

1. Place the foundation and east-facing collection chain: Coordinates are (x,y,z), measured from zero; x increases east, y up, and z south. At y=0, fill x=1..4 in the north row z=0 and south row z=2 with stone bricks. In middle row z=1, place stone at x=0 and x=1, east-facing hoppers at x=2 and x=3, and an east-facing chest at x=4. Shift-click the chest west side to aim the fruit hopper into it, then aim the stem hopper into that hopper. Leave access outside the east side of the chest.
2. Contain water and prepare the two-cell floor: At y=1, make glass rows x=1..4 at z=0 and z=2. In middle row z=1, place glass at x=0 and x=4, a water source at x=1, dirt at x=2, and mud at x=3. Till the dirt into farmland and plant one pumpkin seed. Wait for hydration. The water is contained by the glass, farmland, and foundation. Keep the mud as mud, because ordinary dirt would block hopper pickup.
3. Enclose and illuminate the stem: At y=2, build the north wall z=0 across x=1..4, replacing its x=2 glass with the sea lantern. Build the south wall z=2 across x=1..4 in glass. Place glass at (1,2,1) and (4,2,1). The stem occupies (2,2,1); leave (3,2,1) empty for fruit. The sea lantern illuminates the adjacent stem above light level 9. Let the stem reach maturity; the model depicts age 7.
4. Install the downward observer and piston: At y=3, put the observer at (2,3,1) with its observing face down at the stem and its red output upward. Put the normal piston at (3,3,1) with its wooden head facing down into the fruit cell. Fill the other ten roof positions across x=1..4 and z=0..2 with glass. The roof seals the chamber against escaping drops.
5. Connect the supported redstone bridge: Place stone bricks at (2,4,1) and (3,4,1), directly above the observer and piston. Place redstone dust on each block at y=5, forming an east-west line. The observer strongly powers its upper stone block, which energizes the dust; the neighboring dust powers its support block and the piston directly below. All supports are permanent and included in the material counts.
6. Check harvesting and collection: Allow the mature stem to grow a pumpkin at (3,2,1). The stem attachment should trigger the piston and send a pumpkin into the chest. Check that both hoppers are unpowered and face east. A stem reset can trigger one extra harmless pulse; the piston head occupies only the fruit cell, so there is no self-sustaining observer loop. Keep the chest from filling and stay close enough for random ticks.