C-Fern sporophytes grow well in commercially available ProMix® potting mix. ProMix works very well for both greenhouse or terrarium culture (see mini-terrarium instructions) and has some starter fertilizer in it to get things going. Soil pH is not adjusted when using Promix potting material. Sporophytes grown in mini-terraria typically need no additional fertilization to grow to maturity.
When making your own potting mix, the soil will need to be pH adjusted.
For prolonged greenhouse culture, follow the fertilization instructions in the Greenhouse Culture – Fertilization section.
