Tv : program on growing cannabis

I watched a program last night on people growing cannabis, you are allowed to buy all the equipment from shops and seeds legally from another but u r not allowed 2 put a seed in a pot. Cmon how can that be against the law. Growing plants. For fuck sakes its not a crime. A crime is beating someone up, robbing a bank, murdering someone etc. The only thing that's fucked up with that notion is the fact that the government are jealous on grounds that they can't keep hold on the tax of it basically. So they use they're bouncers of life. The police lol or legal cult. I believe in law and order yes, but the law stating that its wrong 2 put a seed in plant pot lol