Hey there,
A friend of mine with a large orchid collection feeds her orchids an organic guano fertilizer called buddha grow (i sell this on my website
Buddha Grow | Planet Natural) but she also supplements it with the MSU chemical fertilizer. She has excellent results with it.
Personally, I do one watering of MSU orchid fert, then a watering of liquid kelp (which is organic) and then a flush of pure water, and then repeat the process.
One thing to note is kelp is not a complete fert, but contains a rooting stimulant and breaks down into trace nutrients so it is just a supplement to a complete fertilizer.
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