GMSgrowsanswered grow question 3 years ago Even if I grow in soil, I always start my plants in promix hp. This gives you the chance to feed and take proper care for the first 10 days. At that point, their much more prepared to go into soil and won't get to much nutrient for their first days of life. If you get use to growing this way, then you can grow the entire life of the plant in promix hp. Another form of hydroponics and is much faster than soil grows. I like the promix better than cocoa as you can save cash because you don't need any extra cal/mg through the entire grow. It's also only 40 bucks for a huge bag, that goes a long way...