Vertical farming itself is very practical because it avoids land erosion, nutrient depletion of soils and limits harm to nature. Besides that vertical farming can increase yield, nutrient density and taste through a controled environment (I.e. nutrients, light, etc.). It also needs no pesticides because of that controlled environment. Vertical farms also require about ⅓ of the water needed for conventional farming and a lot less land.

It has already been tested on multiple different vegetables, beans (soy beans for example) and leafy greens and it works for all of them. Some require different versions of vertical farming.

The major problem with vertical farming is it's massive energy consumption and expensive construction and maintance. Everything has to work perfectly for it to have optimal results.

The fun part of vertical farming is, that we can also try ourself with GMO in a safe environment, without worrying that the new strand will spread.

Certain food, especially potatoes will be hard to farm in large quantities inside an urban environments and we will still need farm land for it. Just less.

We also need to get away from eating meat as one the largest uses of farmland is for animal feed production.