The Orchid Doctor Articles under the Heading Volcanic Rock

Volcanic Rock Comments
VOLCANIC ROCK: For Paphiopedilum Potting Mixes It does two things, it holds moisture, and after the mixes break down it keeps the mix open and apart. A77-710; used for all types of plants; up to 75% of the mix can be volcanic rock; a professional grower's medium for paphiopedilums with volcanic rock given. OA76-10+ 0

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