Cannabis Activist

Hey guys, I've done one season of outdoor and I am looking to gain more knowledge. I'm looking to mix cow manure with the Pro-Mix HP soil or Pro-Mix BX soil, I've heard good things about both. What're your guys thoughts? I don't know much about nutes and soil PH or water PH levels. Please feel free to leave your tips below. Thanks!

Im happy with regular all purpose promix. Use it on my all my plants. Its a good base to add to.