> Vertical farming would also need to be able to take on more than just greens. That's the thing. It really can't. Grains are very very cheap, and the price ef

> Vertical farming would also need to be able to take on more than just greens. That's the thing. It really can't. Grains are very very cheap, and the price efficiency drops in relation to the water use. (i.e. more water efficient the crop, the less profitable the crop is.) This has been the case with hydroponics for at least 40 years now.