The Orchid Doctor Articles under the Heading Perlag

Perlag Comments
PERLAG: Aggregate As potting medium additive: it is inert, sterile, has neutral pH; experiments with potting 150 seedlings in several mixes; 1/2 coarse Perlag with 1/2 lumpy peat or bark, plus some charcoal is recommended; Perlite can be substituted; refer to OR79-382+; A80-37; see also Orch. Soc. of Gt. Brit. Journal, vol.28, 1979, 112+ 0

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