Maybe that's it. I have mostly young Dens, and they're in a aliflor, charcoal and CHC mix. My plants in 4" and bigger pots are in bark(unless they have fine roots, then same as the seedlings), and they're all growing fine too. I'm going to switch to a hydroton, CHC mix when the bark breaks down. But my bark is fairly new, so it still stays pretty dry.
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