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Granular Gypsum

$3.50

Horticultural grade granular (quick-release) gypsum. Gypsum is commonly used as an ingredient in mushroom substrates and casing mixtures. The primary role of gypsum is to act as a mineral supplement, as it's presence promotes mycelial growth by providing substrates with calcium and sulfur, both essential elements for good fruit body formation. Gypsum is also commonly used to hold the pH of a substrate stable by preventing drastic swings in pH.

Sold in ½ gallon increments.

Pelletized (time-release) gypsum is available here.

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