Rasta is right. The best way to learn how to grow your own, MJ, poppies or fruit, is to learn yourself. Trail and error, over and over, with plenty of patience...but it's fun too. Seeing what works and what doesn't.

As long as you have the basics down of growing, anything, then you should be okay.

To get a seed to grow, dirt, water, light, repeat...a flourishing plant needs food, fertlilizer. Dirt, water, light, feed, repeat.

That's all there is to it. I'm not sure about poppies though, that isn't an interest to me, but good luck on what you're findnig!