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Coronavirus COVID-19

COVID-19 Advisory: WSU Extension is working to keep our communities safe. All Extension programming is being provided virtually, postponed, or canceled. Effective March 16, 2020, WSU Extension county offices and WSU Research & Extension Centers will be closed to the public. We are available via email, phone, and webconference.

Soils and Mulches

Program Contact: Spokane County Master Gardeners
(509) 477-2181 •

WSU Publications:

The WSU Extension Publication Store carries the following helpful publications.  Many publications are available for download at no cost.

  • Home Gardener’s Guide to Soil and Fertilizers
  • Acidifying Soil
  • Organic Soil Amendments in Yards and Gardens
  • Using Biosolids in Gardens and Landscapes

WSU website

Gardening in Washington State