The Orchid Doctor Articles under the Heading Pumice

Pumice Comments
PUMICE: Agricultural Grade Suitable fertilizer for plants grown in it is 10-10-10; pumice is not like bark which requires extra nitrogen to produce good growth. A61-904 0
PUMICE: As a Cymbidium Medium It is not considered as good as bark; in an experimental growth trial lasting three years the plants in pumice became smaller, the root system poorer than those in bark, with the root system showing stunting and tip stoppage; alkalinity may have become the main problem. OA84-79. 0
PUMICE: As Potting Media For its characteristics, a clinical analysis, comparative data with fir bark and osmunda, its many advantages, refer to A61-17+; C72-70+ 0
PUMICE: Definition A light, spongy stone thrown up by volcanoes. A75-712; RMH 0

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