Abstract: The present application relates generally to soilless growing systems (100), such as aeroponic and hydroponic systems, and specifically to modular structures for constructing soilless farms. A soilless farming (100) unit may include a plurality of root chambers (6) for growing plants in a growing zone enclosed by a shell (8), a nutrient delivery system (300, 320, 330, 340) that moistens plant roots in the plurality of root chambers (6), and a plurality of apertures (190) in the shell (8) for connecting the farming unit to an adjacent farming unit via at least one of a fluid conduit (150, 152, 210, 220) and a power supply (230). A soilless growing system (100) may include a building having a perimeter sized to match an arrangement of farming units inside the building. A soilless growing system (100) may be a multi-story building with a plurality of farming units on each story.