I just have some really humus-rich topsoil, fortified with rotten wood from a termite-infested stump, sphagnum peat, sand, and steamed bone meal (6-12-0) as the growing medium. I routinely feed with banana peel puree and have side-dressed with composted chicken manure and raw bone meal (0-10-0). The bone meal helps offset the acidicity caused by the breakdown of the peat moss.
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