The Orchid Doctor Articles under the Heading Acid or Alkaline

Acid or Alkaline Comments
ACID OR ALKALINE: Changing the Values Various means can be used: tufa, a limestone form, can be added to paphiopedilums from limestone cliffs; bark composts acidify with age; peatmoss, pine needles, oak leaves in the mix produce acidity; phosphoric acid is used to adjust pH value exactly. 0R81-110 0

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