CLAY, CALCINED: Expanded Shale or Clay

Culture Orchid Doctor

by Robert M. [Bert] Hamilton (Compiler)

Originally published in The Orchid Doctor in 1980 and 1988

Posted by Sys Admin almost 8 years ago.

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Aggregate material fired under great heat is like volcanic rock, porous, well-aerated but they differ in types; for a current valuation refer to A86-495
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Clay, Calcined Comments
CLAY, CALCINED: As Cymbidium Medium It is not as good as bark mixes, judging from an experimental growth trial of three years; for details refer to OA84-79 0
CLAY, CALCINED: As Cymbidium Mix An aggregate used in making masonry blocks, it is good for culture in pots up to six inches; is alkaline in reaction; mix with bark for larger pots. OA82-6 0
CLAY, CALCINED: Expanded Nodules Most epiphytic orchids grow well in it; use 1-1-1 balanced fertilizer; it holds water and is aereated for good root growth; do not let it dry out; trade names are Crestlite, Haydite, Herculite, Turface. A83-698; RMH 0
CLAY, CALCINED: Haydite As a potting medium for angraecums, the seedlings can be started in it and grown on into a ten-inch pot in about five years and they flower well. Ca84Spring-3 0

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