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Gypsum is added to mushroom growing substrates providing calcium and sulfur.


Gypsum also helps spawn substrate break-up making it easier to mix when needed.


Use at a 2-5% ratio for best results. This usage rate is best measured off the dry-weight of the substrate. 


Can be beneficial for all mushroom kits and beds.


Gypsum is generally PH-7 meaning it is netural and does not affect the substrate's PH much.

Gypsum Mushroom Fertiliser

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