Check out aeroponics, it's still expensive to set up (you need to buy or build these "towers"), but it uses much less space since the towers mostly require vertical space. And the food grows much faster than any other method I'm aware of since the roots are exposed to the air most of the time, drastically increasing oxygen intake.
Check out aeroponics, it's still expensive to set up (you need to buy or build these "towers"), but it uses much less space since the towers mostly require vertical space. And the food grows much faster than any other method I'm aware of since the roots are exposed to the air most of the time, drastically increasing oxygen intake.