mixing up a potting mix
I have a dozen bands from Rogue Valley, all looking great, most with buds, and plan to pot them into gallons this weekend. I usually get whatever Agway is selling as potting mix, stir in some additional compost and call it a day.
I ran into a friend who is an organic gardener, who recommended something called Black Earth, I think it's Canadian product since the label is in French and English, as a very rich base for a potting mix. I bought two 40 lb bags of it this AM, and it is super dense - not in a bad way, but as if you were crumbling freshly baked chocolate devils food cake. I plan to lighten it with perlite. Any suggestions on ratio, or what the finished mix should feel like? Should I add the compost as usual?