While I would not use it STRAIGHT for container gardening, after the plants are old enough to be fertilized, a potting mix of ~60-70% MG Organic + ~30-40% perlite would give you a fine mix, similar to promix but a bit 'hotter'. Treat it sorta like FFOF and go easy on the nutes until you are sure that your plants can take it all. I've played with it a bit and have not particular complaints as long as you don't use it for seedlings, add perlite, and remember to re-pot ever 6 weeks.