I use home recipes a lot for my garden plants but for orchids I prefer to stick to the normal fertilizers. For one, I want to be able to control exactly what my plants get. And organic sources (like the bone, eggs and guano) of fertilizer are not immediately available to the plant. They must be broken down by micoorganisms first. I don't know if bark based mediums have as much micro organism activity as normal soil, so it's possible it takes much longer for them to be broken down and available to the plant. And seeing how airy the medium is, at every watering the fertilizer will be washed out before it has become of use to the plant. I may be wrong, since my courses on this sort of stuff were 4 years ago, but I'll still stick with my trusty orchid fert!
Good luck in your fertilizer business though.
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Camille
Completely orchid obsessed and loving every minute of it....
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