WSU CAHNRS

Washington State University

Gardening in Washington State

Will woody mulch acidify my soils?

In field situations it is difficult to significantly alter soil pH without the addition of chemicals. Temporary changes in pH may be found in the decomposing mulch layer itself, but these have little effect on underlying soils. Significant changes in soil pH can only occur after decades or centuries of mulch use.

pine needles

For more information on wood chip mulches, see “Using Arborist Wood Chips As a Landscape Mulch” WSU Extension Fact Sheet FS160E .

Submitted by: Linda Chalker-Scott, October 12, 2015

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