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  • Epsum salt use in home gardens and landscapes 

    Chalker-Scott, Linda; Guggenheim, Rich (Pullman, Washington : Washington State University Extension, 2018-09)
    Epsom salt is a popular soil amendment for home gardeners with anecdotally-reported value as a fertilizer and pesticide. However, it is not registered as a pesticide, nor should it ever be used as a pesticide. This publication ...
  • Gypsum use in home gardens and landscapes 

    Chalker-Scott, Linda; Guggenheim, Rich (Pullman, Washington : Washington State University Extension, 2018-09)
    Gypsum has long been promoted as a soil amendment for home gardeners who wish to improve their soil structure. Popular books and websites claim that gypsum will loosen compacted soils and improve drainage. Gypsum is also ...