Mushroom compost is generally sold in bags labeled as SMC or SMS (spent mushroom compost or spent mushroom substrate). It is available at many garden centres. Get organic mushroom compost.
Mushroom compost also can be used as a mulch around perennials, trees and shrubs, said Hart. For flower beds and vegetable gardens, till about three inches of the compost into the top six inches of fairly dry garden soil. For containerised plants, fresh mushroom compost should only make up about one-quarter of the volume of soil in the container. Remember that rhododendrons, azaleas, camellias and other members of the heath family may be injured by salts unless mushroom compost is “cured” first.
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