So I've picked out my strain I'm gonna use and I'm about to order it, but I'm wondering if I need some of the special fertilizers or fancy stuff like that to grow weed. I'm growing outside, literally RIGHT next to a stream (it won't flood) so I would think that would make for good fertile soil, and long story short, I have several animals like horses that poop, and I was thinking I could use that as fertilzer. But just in general do I nee that fancy stuff?? Thanks in advance