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Does growing media pH change in the package?

Often, the assumption is made that the pH of an unused, professionally manufactured growing medium in a compressed bale, loose-fill bag or tote will not change over time. Due to the chemistry and moisture inside the package and environmental pressures outside the package, the pH of unused growing medium can increase slowly overtime.

Most professionally produced growing media are composed of any combination of the following physical components: Sphagnum peat moss, aged/composted soft or hardwood bark, wood substrates, coir, compost, perlite, vermiculite, pumice and/or rice hulls. The component percentages vary based upon the type of growing media and its intended use.

Read more at the PRO-MIX website.
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