everything I've heard, worm castings are the cats-ass for growing, it doesn't get any better ... but, outside of the micro-nutrients, I'm not sure what else makes it so good ... I added worms to my potting soil to make it better, figure its just sitting there for awhile, it may as well improve ... as far as fertilizers, my method is to watch the plant, let it tell me when to add nutes ... my opinion only, but I think a lot of unneccessary damage is brought on by too much 'love' for the plants ... (like when I drown mine from too much watering. ..lol) ... :smokin: