Some information from Greg Green's grow Bible, posted by KP for your perusal

[kindprincess]

OFFICIAL DISCLAIMER

I DID NOT WRITE THIS GUIDE. I PUT SEVERAL ARTICLES FROM ONE WEBSITE TOGETHER, IN A DIFFERENT ORDER. I HAVE, HOWEVER READ ALL OF THESE ARTICLES AT LEAST ONCE, AND HAVE PUT ONLY THOSE THAT I DEEMED HELPFUL IN THIS THREAD. I DO NOT, NOR HAVE I EVER INTENDED TO TAKE CREDIT FOR THESE WORKS.

kp