Minecraft wiki entry for Crop_farming, associated text: To farm multiple crops in a single field's footprint, you can stack the fields making a vertical farm. One complication here is that a block is needed to hold the water on each level. A Jack o'Lantern can be used to both hold up the water and provide central lighting, or any block can have torches placed on it. The fields can be stacked with two-block or three-block spacing. Harvesting can be easily done by using a water bucket on the bottom of the lighting block (three block spacing) or the top of the waterlogged slab (two-block spacing, but must manually break the corner plants). Alternatively, you can irrigate all levels with a waterfall through the (empty) center block spaces. and provide lighting elsewhere.