Answer: Most potting soils you can purchase at a garden center have been "buffered" to a near-neutral pH, since that's what most plants need to thrive. Adjusting pH is relatively easy, but it usually takes a few months for the mineral amendments to work their magic. Which amendment you use, and the amount used are based on your soil type (clay, loam, sandy), where your pH registers and your target pH. Ground limestone is used to raise pH, and sufur acidifies, or lowers pH. If you've done a home test or have the extension service (ph# 507/662-5293) test your soil, a lime or sulfur recommendation should be part of the package. Let us know if you need more information.
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