Here are the amounts we’ve found will produce the best-tasting buds and strongest medicines: 8 large bags of a high-quality organic potting soil with coco fiber and mycorrhizae (i.e., your base soil) 25 to 50 lbs of organic worm castings 5 lbs steamed bone meal 5 lbs Bloom bat guano 5 lbs blood meal 3 lbs rock phosphate ¾ cup Epson salts ½ cup sweet lime (dolomite) ½ cup azomite (trace elements) 2 tbsp powdered humic acid This is the same basic recipe I’ve been using for the past 15 years. The hardest ingredient to acquire are the worm castings (especially since many people don’t even know what they are. FYI: worm poop). But don’t decide to just skip them: Be resourceful. After all, worms comprise up to ¾ of the living organisms found underground, and they’re crucial to holding our planet together. Also, don’t waste money on a “soil conditioner” with worm castings; source out some local pure worm poop with no added mulch.