Spent mushroom compost is made from a once used blend of wheat straw, horse and chicken manure. The proportions vary and are related to the variations in products used to formulate this.
The blend is sterilised before being inoculated with mushroom spawn. One crop of mushrooms is taken and then the compost is released to the landscape and farming markets.
This product will raise your pH slightly so shouldn’t be used on ericaceous plants.
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