I use his original recipe, which used Pro-mix instead of organic soil...Promix is more consistent, cleaner, and easier for me to get. Been using it for about 5 years now. Recently experimented with recycling it with new amendments. I wound up with powdery mildew and can't help but wonder if there was any correlation. My gut tells me there is. I'm going with fresh mix every time now, and save the old for growing vegetables!
Rest in peace subcool