Adam, I'm layering a new currant and perennial pollinator bed.
How did you decide the order of the layers?
So far I've done several layers of cardboard, then biochar, then bedding from the duck house, and I'll top with woodchips. It didn't occur to me to put the charcoal under the cardboard but it makes sense. I might try that in another spot.
I've found cardboard to take a while to break down here (should be gone toward the end of next summer, but probably not by spring) and I wanted the char closer to the root zone of the berries rather than over the cardboard. I added the bedding/manure under the cardboard because I'm not totally convinced that the char was fully charged with nitrogen etc in my quench. Mostly I'm throwing stuff at the wall, the main variety of raspberry (doublegold) has been vigorous for me, so chips over cardboard would probably work fine, but I had char and manure too.
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