What kind of soil is needed to grow sporophytes? Does soil pH need to be adjusted?
The soil we routinely use now is readily available commercially as 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. We do not adjust pH with this potting material. Sporophytes grown in mini-terraria typically need no additional fertilization to grow to maturity. For prolonged greenhouse culture, follow the fertilization instructions in the Fertilization of Sporophytes< section of the C-Fern Web Manual or in the C-Fern Manual.