They've been in the same potting mix for years. I put more peat on top as it subsides. They're in large glazed ceramic containers holding about 15 gallons of peat. Remember blueberries are semibog plants accustomed to growing in wet or damp peat.
Pine bark will have a lot more resin than pine needles. I don't know whether this would be a problem. I can tell you they grow fine in straight peat. Mixing in a lot of perlite with peat might be a good idea to make the containers lighter if you want to move them.
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