Perlite

Perlite [ Horticulture ]

Dictionary of botanic terminology - index of names

A volcanic mineral heated to make it expand. This reduces its density and helps increase porosity when added to potting soil.

Perlite is an inert material derived from a naturally occurring volcanic rock, which when expanded by a heating process, forms white, lightweight granules. Perlite is a good soil amendment added to container potting mixes or other growing medium, to promote moisture retention while allowing good drainage. It is also useful to introduce air pockets in the soil enhancing aeration as well as to keep the soil from compacting. Perlite is chemically a sodium potassium aluminum silicate. Its size ranges, but it is about as large as gravel. See also vermiculite.

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