The Orchid Doctor Articles under the Heading Scoria

Scoria Comments
SCORIA: Definition Lava rock, or pumice or basalt, etc. RMH 0
SCORIA: Lightweight Form of Basalt Has a porous structure which holds both air and water in balanced proportions; can be used alone for some species, with fertilizer; with fine materials it may waterlog; holds nutrients in an available form; has a pH of 7.0 to 10, varying with the source of the rock; abrasive. AU79-53 0

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