Many orchids can be grown symbiotically like they grow in nature. The cardboard method uses cellulose in the form of cardboard to act as a food source for the symbiotic fungi. It's quite effective for many terrestrial species, less so for epiphytes.
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Getting the seeds to grow is not hard, growing them to a large size is hard. On my first try I had a flask with over 1000 in it, but mold has taken out 98%, I am hoping I get 5 or 6 to bloom.