The most valuable aspect of SMS is its high organic matter. This allows soil to retain moisture in dry weather and shed it during wet weather. By creating air spaces, SMS acts a sponge in gravel or sandy soils and permits clay soils to drain. SMS will not leach from the ground. Nutrients remain in the soil and, unlike inorganic fertilizers, do not contribute to groundwater pollution if applied correctly.

There are many advantages of SMS over other composts produced from food and garden wastes including:

• A consistent, formulated and homogeneous product
  The SMS production cycle occurs all year round with consistent materials and compost products.
• High water and nutrient holding capacity
  SMS includes sphagnum peat and an organic matter formulation resulting in moisture and nutrient retention.
• Weed free nature
  Extensive composting and indoor pasteurization ensures that weed seeds cannot enter the product.
• No nitrogen draw-down problems
  Unlike wood and paper wastes frequently found in other products, SMS has been supplemented with nitrogen.
• Absence of heavy metals
  Reduces consumer concerns.

For sample mushroom compost labels, click one of the following links: Active Label Sample, Passive Label, or Fresh Label Sample.

For an analysis of the primary plant nutrients in SMS, click here.

SMS supports plant growth and is a good soil amendment for farming, turf management, land reclamation and home gardening. Research studies on the many benefits of SMS are available.

Web site produced with a grant from the Pennsylvania Department of Agriculture.