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Stamets Casing Mixture

Another casing mixture recipe.

The recipe is originally from Growing Gourmet & Medicinal Mushrooms, by Stamets.

Use the following procedure to create the casing material. Then substitute it into any casing method.


  • 10 units peat
  • 1 unit calcium sulfate (gypsum)
  • 1 unit calcium carbonate (chalk)


Use calcium carbonate to adjust pH of peat.

Mix dry components - add water slowly, when water can be squeezed out to form brief rivulets, then proper moisture has probably been achieved.

A 75% moisture content is ideal and can be tested by measuring the moisture lost from a sample dried in a hot oven.

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