2 plants in 1 pot?

A question from a fellow grower:

Hi there quick question is it possible to grow two plants in one pot? N if so wat size pot would u recommend? Ok two questions lol would u use one regular growing pot or a self watering pot? Thank.

You can grow 2 plants in one pot, but each will fight the other for nutrients, and root space.

Basic grow knowledge insists on 1 plant per pot.