I fertilized mine only with Osmocote extended release fertilizer, the 6 month one, and had excellent bulb production. However if you follow the culture links on the Kusamono site, you'll see that the media these are planted in makes a big difference. I'm going to stick with 90% perlite with balance chopped pine needles and sphagnum as this seemed perfect given the results.
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fine print - anything I say cannot be used against me and ymmv on any growing advice
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