Dick, Nutrient balance can indeed be a problem, when one tries to germinate orchid species seeds symbiotically on media that contain sugars etc.
Asymbiotically germinated orchid species seedlings can usually be infected very easily with their symbiont and without getting into nutrient balance problems. Two ways of doing it are: A) Introduce the symbiont from "pure culture" to sterile seedlings on sterile natural and nutrient poor medium. OR B) Introduce the symbiont from "pure culture" to non-sterile seedlings in compot Please contact me off the OGD, for details. Peter
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