"As such, techniques like plant tissue culture that are commonly done with other crops and expensive ornamentals in the U.S. are rarely done with cannabis because growers that do these techniques are often tight lipped about things such as the most ideal media composition or really anything else related to methodology."

There are so many cannabis forums on the internet (I used to be on the top 5 waaaaay back in the day) that you can find tons of research and tips on various culture methods. Right down to micro-sample cloning techniques.