rhodes68answered grow question 5 years ago Go to youtube and search for cannabis seed making think the guy runs the Grow Pot Cheaply channel.
He does go into some good detail on the subject, one thing to keep in mind is those seeds have to mature so early enough to give them a few weeks.
Of course the plant can go way over as you wont be interested in the buds.
Watch the vid its pretty decent
Good luck we will be trying this soon.