[lwb]

Interested in links or books on this if you know any good ones. Don't you still have to use soil?

[Scoundreller]

Probably hydroponics? Soil is adds more variables and can be a home to pests/microbes.

[pcmaffey]

Hydro grown plants are often more susceptible to pests and problems because they lack the natural fortifications provided by soil. Large scale living soil can still be done indoors though.