The Orchid Doctor Articles under the Heading Limestone

Limestone Comments
LIMESTONE: Added to Potting Mix For a mix of fir bark and redwood bark add 1/2 pound of pulverized high magnesium limestone to each cubic foot. A64-591; A75-437; this procedure not considered necessary, as the pH of the fir bark changes with aging. A59-496 0
LIMESTONE: For Paphiopedilums In nature warm rain does not dissolve the limestone substrate where Brachypetalum types grow; in greenhouses cold water dissolves an excess of the liberal supply sometimes erroneously added to the mix and it harms the plants. A77-143 0

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