Description
WHAT IS PERLITE?
Expanded perlite is a mineral product that has been subjected to an expansion process at 1200 ºC, it is inert, stable, neutral (pH between 6.5 and 7), sterile, light and insulating.
It is a substrate that has been used as an additive in peat-based substrates but can also be used as a sole substrate for growing crops. It is a hydrated obsidian mineral that has been subjected to high temperatures.
It is a light substrate with great oxygenation and hence its properties as part of other substrates. As a sole substrate it may have more problems since a pH lower than 5.5 could cause aluminum phototoxicity (which could be confused with Ca and Mg deficiency).
Its use in hydroponics in North America is limited to being part of a substrate with 70 or 80% coconut and the rest perlite.
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