As you already know there are many mediums to grow your marijuana in. Hydroponics grows plants in rockwool, clay pellets, and lots of different kinds of crap. I even had a customer growing in chunks of broken bricks from a building a construction crew knocked down next door to his house. Aeroponics even grows them out in thin air. All these different grow mediums but many of my friends, colleages, and customers have all remarked that it just doesn't taste as good as good old fashion soil.