man, I'm on my first grow, and I just used a couple seeds out of a bag of really good bud I had, and thats fine since it's only my first grow, but I would definatly want to buy seeds next time, only cause I don't know what kind my babies are!! I wish I knew what kinda plants they were, cause my friends are gonna be like "what kinda bud is this?" and I'll say "it's a rare strain, called rickhighly420"... I don't know, it just sucks not knowing what kind of marijuana you are growing.